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What is a Proxy Server and How Does it Work? - Varonis

What is a Proxy Server and How Does it Work? – Varonis

The actual nuts and bolts of how the internet works are not something people often stop to consider. The problem with that is the inherent danger of data security breaches and identity theft that come along with the cute dog pictures, 24-hour news updates, and great deals online.
But what actually happens when you browse the web? You might be using a proxy server at your office, on a Virtual Private Network (VPN) or you could be one of the more tech-savvy who always use a proxy server of some kind or another.
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What’s a Proxy Server?
A proxy server is any machine that translates traffic between networks or protocols. It’s an intermediary server separating end-user clients from the destinations that they browse. Proxy servers provide varying levels of functionality, security, and privacy depending on your use case, needs, or company policy.
If you’re using a proxy server, traffic flows through the proxy server on its way to the address you requested. The request then comes back through that same proxy server (there are exceptions to this rule), and then the proxy server forwards the data received from the website to you.
If that’s all it does, why bother with a proxy server? Why not just go straight from to the website and back?
Modern proxy servers do much more than forward web requests, all in the name of data security and network performance. Proxy servers act as a firewall and web filter, provide shared network connections, and cache data to speed up common requests. A good proxy server keeps users and the internal network protected from the bad stuff that lives out in the wild internet. Lastly, proxy servers can provide a high level of privacy.
How Does a Proxy Server Operate?
Every computer on the internet needs to have a unique Internet Protocol (IP) Address. Think of this IP address as your computer’s street address. Just as the post office knows to deliver your mail to your street address, the internet knows how to send the correct data to the correct computer by the IP address.
A proxy server is basically a computer on the internet with its own IP address that your computer knows. When you send a web request, your request goes to the proxy server first. The proxy server then makes your web request on your behalf, collects the response from the web server, and forwards you the web page data so you can see the page in your browser.
When the proxy server forwards your web requests, it can make changes to the data you send and still get you the information that you expect to see. A proxy server can change your IP address, so the web server doesn’t know exactly where you are in the world. It can encrypt your data, so your data is unreadable in transit. And lastly, a proxy server can block access to certain web pages, based on IP address.
What are Forward Proxies
A forward proxy server sits between the client and an external network. It evaluates the outbound requests and takes action on them before relaying that request to the external resource.
Most proxy services that you’re likely to encounter are forward proxies. Virtual Private Networks and Web content filters are both examples of forward proxies.
What are Reverse Proxies
A reverse proxy server sits between a network and multiple other internal resources. A large website might have dozens of servers that collectively serve requests from a single domain. To accomplish that, client requests would resolve to a machine that would act as a load balancer. The load balancer would then proxy that traffic back to the individual servers.
Some popular open source reverse proxies are:
Varnish
Squid
Why Should You Use a Proxy Server?
There are several reasons organizations and individuals use a proxy server.
To control internet usage of employees and children: Organizations and parents set up proxy servers to control and monitor how their employees or kids use the internet. Most organizations don’t want you looking at specific websites on company time, and they can configure the proxy server to deny access to specific sites, instead redirecting you with a nice note asking you to refrain from looking at said sites on the company network. They can also monitor and log all web requests, so even though they might not block the site, they know how much time you spend cyberloafing.
Bandwidth savings and improved speeds: Organizations can also get better overall network performance with a good proxy server. Proxy servers can cache (save a copy of the website locally) popular websites – so when you ask for, the proxy server will check to see if it has the most recent copy of the site, and then send you the saved copy. What this means is that when hundreds of people hit at the same time from the same proxy server, the proxy server only sends one request to This saves bandwidth for the company and improves the network performance.
Privacy benefits: Individuals and organizations alike use proxy servers to browse the internet more privately. Some proxy servers will change the IP address and other identifying information the web request contains. This means the destination server doesn’t know who actually made the original request, which helps keeps your personal information and browsing habits more private.
Improved security: Proxy servers provide security benefits on top of the privacy benefits. You can configure your proxy server to encrypt your web requests to keep prying eyes from reading your transactions. You can also prevent known malware sites from any access through the proxy server. Additionally, organizations can couple their proxy server with a Virtual Private Network (VPN), so remote users always access the internet through the company proxy. A VPN is a direct connection to the company network that companies provide to external or remote users. By using a VPN, the company can control and verify that their users have access to the resources (email, internal data) they need, while also providing a secure connection for the user to protect the company data.
Get access to blocked resources: Proxy servers allow users to circumvent content restrictions imposed by companies or governments. Is the local sportsball team’s game blacked out online? Log into a proxy server on the other side of the country and watch from there. The proxy server makes it look like you are in California, but you actually live in North Carolina. Several governments around the world closely monitor and restrict access to the internet, and proxy servers offer their citizens access to an uncensored internet.
Now that you have an idea about why organizations and individuals use a proxy server, take a look at the risks below.
Proxy Server Risks
You do need to be cautious when you choose a proxy server: a few common risks can negate any of the potential benefits:
Free proxy server risks
You know the old saying “you get what you pay for? ” Well, using one of the many free proxy server services can be quite risky, even the services using ad-based revenue models.
Free usually means they aren’t investing heavily in backend hardware or encryption. You’ll likely see performance issues and potential data security issues. If you ever find a completely “free” proxy server, tread very carefully. Some of those are just looking to steal your credit card numbers.
Browsing history log
The proxy server has your original IP address and web request information possibly unencrypted, saved locally. Make sure to check if your proxy server logs and saves that data – and what kind of retention or law enforcement cooperation policies they follow.
If you expect to use a proxy server for privacy, but the vendor is just logging and selling your data you might not be receiving the expected value for the service.
No encryption
If you use a proxy server without encryption, you might as well not use a proxy server. No encryption means you are sending your requests as plain text. Anyone who is listening will be able to pull usernames and passwords and account information really easily. Make sure whatever proxy server you use provides full encryption capability.
Types of Proxy Servers
Not all proxy servers work the same way. It’s important to understand exactly what functionality you’re getting from the proxy server, and ensure that the proxy server meets your use case.
Transparent Proxy
A transparent proxy tells websites that it is a proxy server and it will still pass along your IP address, identifying you to the web server. Businesses, public libraries, and schools often use transparent proxies for content filtering: they’re easy to set up both client and server side.
Anonymous Proxy
An anonymous proxy will identify itself as a proxy, but it won’t pass your IP address to the website – this helps prevent identity theft and keep your browsing habits private. They can also prevent a website from serving you targeted marketing content based on your location. For example, if knows you live in Raleigh, NC, they will show you news stories they feel are relevant to Raleigh, NC. Browsing anonymously will prevent a website from using some ad targeting techniques, but is not a 100% guarantee.
Distorting proxy
A distorting proxy server passes along a false IP address for you while identifying itself as a proxy. This serves similar purposes as the anonymous proxy, but by passing a false IP address, you can appear to be from a different location to get around content restrictions.
High Anonymity proxy
High Anonymity proxy servers periodically change the IP address they present to the web server, making it very difficult to keep track of what traffic belongs to who. High anonymity proxies, like the TOR Network, is the most private and secure way to read the internet.
Proxy servers are a hot item in the news these days with the controversies around Net Neutrality and censorship. By removing net neutrality protections in the United States, Internet Service Providers (ISP) are now able to control your bandwidth and internet traffic. ISPs can potentially tell you what sites you can and cannot see. While there’s a great amount of uncertainty around what is going to happen with Net Neutrality, it’s possible that proxy servers will provide some ability to work around an ISPs restrictions.
Varonis analyzes data from proxy servers to protect you from data breaches and cyber attacks. The addition of proxy data gives more context to better analyze user behavior trends for abnormalities. You can get an alert on that suspicious activity with actionable intelligence to investigate and deal with the incident.
For example, a user accessing GDPR data might not be significant on its own. But if they access GDPR data and then try to upload it to an external website, it could be an exfiltration attempt and potential data breach. Without the context provided by file system monitoring, proxy monitoring, and Varonis threat models, you might see these events in a vacuum and not realize you need to prevent a data breach.
Get a 1:1 demo to see these threat models in action – and see what your proxy data could be telling you.
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Java Networking and Proxies

Java Networking and Proxies

Java Software
Java SE Downloads
Java SE 8 Documentation
1) Introduction
In today’s networking environments, particularly corporate ones,
application developers have to deal with proxies almost as often as
system administrators. In some cases the application should use the
system default settings, in other cases it will we want to have a
very tight control over what goes through which proxy, and,
somewhere in the middle, most applications will be happy to
delegate the decision to their users by providing them with a GUI
to set the proxy settings, as is the case in most browsers.
In any case, a development platform, like Java, should provide
mechanisms to deal with these proxies that are both powerful and
flexible. Unfortunately, until recently, the Java platform wasn’t
very flexible in that department. But all that changed in Java SE 5. 0
as new API have been introduced to address this shortcoming, and
the purpose of this document is to provide an in-depth explanation of
all these APIs and mechanisms, the old ones, which are still valid,
as well as the new ones.
2) System Properties
Up until Java SE 1. 4 system properties were the only way to set
proxy servers within the Java networking API for any of the
protocol handlers. To make matters more complicated, the names of
these properties have changed from one release to another and some
of them are now obsolete even if they are still supported for
compatibility’s sake.
The major limitation of using system properties is that they are
an “all or nothing” switch. Meaning that once a proxy
has been set for a particular protocol, it will affect all
connections for that protocol. It’s a VM wide behavior.
There are 2 main ways to set system properties:
As a command line option when invoking the VM
Using the tProperty(String, String)
method, assuming, of course that you have permission to do so.
Now, let’s take a look, protocol by protocol, at the properties
you can use to set proxies. All proxies are defined by a host name
and a port number. The later is optional as, if it is not
specified, a standard default port will be used.
2. 1) HTTP
There are 3 properties you can set to specify the proxy that
will be used by the protocol handler:
oxyHost: the host name of the proxy
server
oxyPort: the port number, the default value
being 80.
nProxyHosts:a list of hosts that should be
reached directly, bypassing the proxy. This is a list of patterns
separated by ‘|’. The patterns may start or end with a ‘*’ for
wildcards. Any host matching one of these patterns will be reached
through a direct connection instead of through a proxy.
Let’s look at a few examples assuming we’re trying to execute
the main method of the GetURL class:
$ java GetURL
All connections will go through the proxy server at
listening on port 80 (we didn’t
specify any port, so the default one is used).
$ java oxyPort=8080
nProxyHosts=”localhost|” GetURL
In that second example, the proxy server will still be at, but this time listening on port
8080. Also, the proxy won’t be used when connecting to either
localhost or
As mentioned earlier, these settings affect all connections
during the entire lifetime of the VM invoked with these options.
However it is possible, using the tProperty() method, to
have a slightly more dynamic behavior.
Here is a code excerpt showing how this can be done:
//Set the proxy to
tProperty(“oxyHost”, “”);
tProperty(“oxyPort”, “8080”);
// Next connection will be through proxy.
URL url = new URL(“);
InputStream in = Stream();
// Now, let’s ‘unset’ the proxy.
earProperty(“oxyHost”);
// From now on connections will be done directly.
This works reasonably well, but it
can get tricky if your application is multi-threaded. Remember,
system properties are “VM wide” settings, so all
threads are affected. Which means that the code in one thread
could, as a side effect, render the code in an other thread
inoperative.
2. 2) HTTPS
The ( over SSL) protocol handler has its own set of
properties:
oxyHost
oxyPort
As you probably guessed these work in the exact same manner as
their counterparts, so we won’t go into much detail except to
mention that the default port number, this time, is 443 and that
for the “non proxy hosts” list, the HTTPS protocol handler will use
the same as the handler (i. e.
nProxyHosts).
2. 3) FTP
Settings for the FTP protocol handler follow the same rules as
for, the only difference is that each property name is now
prefixed with ‘ftp. ‘ instead of
‘. ‘
Therefore the system properties are:
oxHost
nProxyHosts
Note that, this time, there is a separate property for the “non
proxy hosts” list. Also, as for, the default port number value
is 80. It should be noted that when going through a proxy, the FTP
protocol handler will actually use HTTP to issue commands to the
proxy server, which explains why this is the same default port
number.
Let’s examine a quick example:
$ java
oxyPort=8080 oxyPort=8080 GetURL
Here, both the HTTP and the FTP protocol handlers will use the
same proxy server at
2. 4) SOCKS
The SOCKS protocol, as defined in RFC 1928, provides a framework
for client server applications to safely traverse a firewall both
at the TCP and UDP level. In that sense it is a lot more generic
than higher level proxies (like HTTP or FTP specific proxies). Java SE
5. 0 provides SOCKS support for client TCP sockets.
There are 2 system properties related to SOCKS:
socksProxyHost for the host name of the SOCKS
proxy server
socksProxyPort for the port number, the default
value being 1080
Note that there is no dot (‘. ‘) after the prefix this time. This
is for historical reasons and to ensure backward compatibility.
Once a SOCKS proxy is specified in this manner, all TCP connections
will be attempted through the proxy.
Example:
Here, during the execution of the code, every outgoing TCP
socket will go through the SOCKS proxy server at
Now, what happens when both a SOCKS proxy and a HTTP proxy are
defined? Well the rule is that settings for higher level protocols,
like HTTP or FTP, take precedence over SOCKS settings. So, in that
particular case, when establishing a HTTP connection, the SOCKS
proxy settings will be ignored and the HTTP proxy will be
contacted. Let’s look at an example:
GetURL
Here, an URL will go through
because the settings
take precedence. But what about an ftp URL? Since no specific proxy
settings were assigned for FTP, and since FTP is on top of TCP,
then FTP connections will be attempted through the SOCKS proxy
server at If an FTP proxy
had been specified, then that proxy would have been used
instead.
3) Proxy class
As we have seen, the system properties are powerful, but not
flexible. The “all or nothing” behavior was justly deemed too
severe a limitation by most developers. That’s why it was decided
to introduce a new, more flexible, API in Java SE 5. 0 so that it would
be possible to have connection based proxy settings.
The core of this new API is the Proxy class which represents a
proxy definition, typically a type (, socks) and a socket
address. There are, as of Java SE 5. 0, 3 possible types:
DIRECT which represents a direct connection, or
absence of proxy.
HTTP which represents a proxy using the HTTP
protocol.
SOCKS which represents proxy using either SOCKS v4
or v5.
So, in order to create an HTTP proxy object you would call:
SocketAddress addr = new
InetSocketAddress(“”, 8080);
Proxy proxy = new Proxy(, addr);
Remember, this new proxy object represents a proxy
definition, nothing more. How do we use such an object? A
new openConnection() method has been added to the URL
class and takes a Proxy as an argument, it works the same way as
openConnection() with no arguments, except it forces
the connection to be established through the specified proxy,
ignoring all other settings, including the system properties
mentioned above.
So completing the previous example, we can now add:
URLConnection conn = Connection(proxy);
Simple, isn’t it?
The same mechanism can be used to specify that a particular URL
has to be reached directly, because it’s on the intranet for
example. That’s where the DIRECT type comes into play. But, you
don’t need to create a proxy instance with the DIRECT type, all you
have to do is use the NO_PROXY static member:
URL url2 = new URL(“);
URLConnection conn2 = Connection(_PROXY);
Now, this guarantees you that this specific URL will be
retrieved though a direct connection bypassing any other proxy
settings, which can be convenient.
Note that you can force a URLConnection to go through a SOCKS
proxy as well:
SocketAddress addr = new InetSocketAddress(“”, 1080);
That particular FTP connection will be attempted though the
specified SOCKS proxy. As you can see, it’s pretty
straightforward.
Last, but not least, you can also specify a proxy for individual
TCP sockets by using the newly introduced socket constructor:
Socket socket = new Socket(proxy);
InetSocketAddress dest = new InetSocketAddress(“”, 1234);
nnect(dest);
Here the socket will try to connect to its destination address
() through the specified SOCKS proxy.
As for URLs, the same mechanism can be used to ensure that a
direct (i. e. not through any proxy) connection should be attempted
no matter what the global settings are:
Socket socket = new Socket(_PROXY);nnect(new InetAddress(“localhost”, 1234));
Note that this new constructor, as of Java SE 5. 0, accepts only 2
types of proxy: SOCKS or DIRECT (i. the NO_PROXY instance).
4) ProxySelector
As you can see, with Java SE 5. 0, the developer gains quite a bit
of control and flexibility when it comes to proxies. Still, there
are situations where one would like to decide which proxy to use
dynamically, for instance to do some load balancing between
proxies, or depending on the destination, in which case the API
described so far would be quite cumbersome. That’s where the
ProxySelector comes into play.
In a nutshell the ProxySelector is a piece of code that will
tell the protocol handlers which proxy to use, if any, for any
given URL. For example, consider the following code:
URLConnection conn = Connection();
InputStream in = tInputStream();
At that point the HTTP protocol handler is invoked and it will
query the proxySelector. The dialog might go something like
that:
Handler: Hey dude, I’m trying to reach,
should I use a proxy?
ProxySelector: Which protocol do you intend to use?
Handler:, of course!
ProxySelector: On the default port?
Handler: Let me check…. Yes, default port.
ProxySelector: I see. Then you shall use
on port 8080 as a proxy.
Handler: Thanks. Dude,
doesn’t seem to be responding! Any other
option?
ProxySelector: Dang! OK, try, on port
8080 as well.
Handler: Sure. Seems to be working. Thanks.
ProxySelector: No sweat. Bye.
Of course I’m embellishing a bit, but you get the idea.
The best thing about the ProxySelector is that it is plugable!
Which means that if you have needs that are not covered by the
default one, you can write a replacement for it and plug it in!
So what is a ProxySelector? Let’s take a look at the class
definition:
public abstract class ProxySelector {
public static ProxySelector getDefault();
public static void setDefault(ProxySelector ps);
public abstract List select(URI uri);
public abstract void connectFailed(URI uri,
SocketAddress sa, IOException ioe);}
As we can see, ProxySelector is an abstract class with 2 static
methods to set, or get, the default implementation, and 2 instance
methods that will be used by the protocol handlers to determine
which proxy to use or to notify that a proxy seems to be
unreachable. If you want to provide your own ProxySelector, all you
have to do is extend this class, provide an implementation for
these 2 instance methods then call tDefault()
passing an instance of your new class as an argument. At this point
the protocol handlers, like or ftp, will query the new
ProxySelector when trying to decide what proxy to use.
Before we see in details how to write such a ProxySelector,
let’s talk about the default one. Java SE 5. 0 provides a default
implementation which enforces backward compatibility. In other
terms, the default ProxySelector will check the system properties
described earlier to determine which proxy to use. However, there
is a new, optional feature: On recent Windows systems and on Gnome
2. x platforms it is possible to tell the default ProxySelector to
use the system proxy settings (both recent versions of Windows and
Gnome 2. x let you set proxies globally through their user
interface). If the system property
is set to true (by default
it is set to false for compatibility sake), then the default
ProxySelector will try to use these settings. You can set that
system property on the command line, or you can edit the JRE
installation file lib/operties, that way you
have to change it only once on a given system.
Now let’s examine how to write, and install, a new
ProxySelector.
Here is what we want to achieve: We’re pretty happy with the
default ProxySelector behavior, except when it comes to and. On our network we have more than one possible proxy for
these protocols and we’d like our application to try them in
sequence (i. : if the first one doesn’t respond, then try
the second one and so on). Even more, if one of them fails too many
time, we’ll remove it from the list in order to optimize things a
bit.
All we need to do is subclass
and provide implementations for
both the select() and connectFailed()
methods.
The select() method is called by the protocol
handlers before trying to connect to a destination. The argument
passed is a URI describing the resource (protocol, host and port
number). The method will then return a List of Proxies. For
instance the following code:
will trigger the following pseudo-call in the protocol
handler:
List l = tDefault()(new URI(“));
In our implementation, all we’ll have to do is check that the
protocol from the URI is indeed (or), in which case we
will return the list of proxies, otherwise we just delegate to the
default one. To do that, we’ll need, in the constructor, to store a
reference to the old default, because ours will become the
default.
So it is starting to look like this:
public class MyProxySelector extends ProxySelector {
ProxySelector defsel = null;
MyProxySelector(ProxySelector def) {
defsel = def;}
public select(URI uri) {
if (uri == null) {
throw new IllegalArgumentException(“URI can’t be null. “);}
String protocol = tScheme();
if (“”. equalsIgnoreCase(protocol) ||
“”. equalsIgnoreCase(protocol)) {
ArrayList l = new ArrayList();
// Populate the ArrayList with proxies
return l;}
if (defsel! = null) {
return (uri);} else {
(_PROXY);
return l;}}}
First note the constructor that keeps a reference to the old
default selector. Second, notice the check for illegal argument in
the select() method in order to respect the specifications.
Finally, notice how the code defers to the old default, if there
was one, when necessary. Of course, in this example, I didn’t
detail how to populate the ArrayList, as it not of particular
interest, but the complete code is available in the appendix if
you’re curious.
As it is, the class is incomplete since we didn’t provide an
implementation for the connectFailed() method. That’s
our very next step.
The connectFailed() method is called by the
protocol handler whenever it failed to connect to one of the
proxies returned by the select() method. 3 arguments
are passed: the URI the handler was trying to reach, which should
be the one used when select() was called, the
SocketAddress of the proxy that the handler was trying
to contact and the IOException that was thrown when trying to
connect to the proxy. With that information, we’ll just do the
following: If the proxy is in our list, and it failed 3 times or
more, we’ll just remove it from our list, making sure it won’t be
used again in the future. So the code is now:
public void connectFailed(URI uri, SocketAddress sa, IOException ioe) {
if (uri == null || sa == null || ioe == null) {
throw new IllegalArgumentException(“Arguments can’t be null. “);}
InnerProxy p = (sa);
if (p! = null) {
if (() >= 3)
(sa);} else {
if (defsel! = null)
nnectFailed(uri, sa, ioe);}}
Pretty straightforward isn’t it. Again we have to check the
validity of the arguments (specifications again). The only thing we
do take into account here is the SocketAddress, if it’s one of the
proxies in our list, then we do deal with it, otherwise we defer,
again, to the default selector.
Now that our implementation is, mostly, complete, all we have to
do in the application is to register it and we’re done:
public static void main(String[] args) {
MyProxySelector ps = new MyProxySelector(tDefault());
tDefault(ps);
// rest of the application}
Of course, I simplified things a bit for the sake of clarity, in
particular you’ve probably noticed I didn’t do much Exception
catching, but I’m confident you can fill in the blanks.
It should be noted that both Java Plugin and Java Webstart do
replace the default ProxySelector with a custom one to integrate
better with the underlying platform or container (like the web
browser). So keep in mind, when dealing with ProxySelector, that
the default one is typically specific to the underlying platform
and to the JVM implementation. That’s why it is a good idea, when
providing a custom one, to keep a reference to the older one, as
we’ve done in the above example, and use it when necessary.
5) Conclusion
As we have now established Java SE 5. 0 provides quite a number of
ways to deal with proxies. From the very simple (using the system
proxy settings) to the very flexible (changing the ProxySelector,
albeit for experienced developers only), including the per
connection selection courtesy of the Proxy class.
Appendix
Here is the full source of the ProxySelector we developed in this document. Keep in mind that this was written for educational purposes only, and was therefore kept pretty simple on purpose.
import *;
import;
// Keep a reference on the previous default
/*
* Inner class representing a Proxy and a few extra data
*/
class InnerProxy {
Proxy proxy;
SocketAddress addr;
// How many times did we fail to reach this proxy?
int failedCount = 0;
InnerProxy(InetSocketAddress a) {
addr = a;
proxy = new Proxy(, a);}
SocketAddress address() {
return addr;}
Proxy toProxy() {
return proxy;}
int failed() {
return ++failedCount;}}
* A list of proxies, indexed by their address.
HashMap proxies = new HashMap();
// Save the previous default
defsel = def;
// Populate the HashMap (List of proxies)
InnerProxy i = new InnerProxy(new InetSocketAddress(“”, 8080));
(dress(), i);
i = new InnerProxy(new InetSocketAddress(“”, 8080));
(dress(), i);}
* This is the method that the handlers will call.
* Returns a List of proxy.
// Let’s stick to the specs.
* If it’s a (or) URL, then we use our own
* list.
for (InnerProxy p: ()) {
(Proxy());}
* Not HTTP or HTTPS (could be SOCKS or FTP)
* defer to the default selector.
return l;}}
* Method called by the handlers when it failed to connect
* to one of the proxies returned by select().
// Let’s stick to the specs again.
* Let’s lookup for the proxy
* It’s one of ours, if it failed more than 3 times
* let’s remove it from the list.
* Not one of ours, let’s delegate to the default.
nnectFailed(uri, sa, ioe);}}}

Frequently Asked Questions about proxy sa

What does proxy mean in it?

A. P. A proxy server is a computer system or router that functions as a relay between client and server. It helps prevent an attacker from invading a private network and is one of several tools used to build a firewall. The word proxy means “to act on behalf of another,” and a proxy server acts on behalf of the user.

What is proxy setting?

A proxy server sits between your machine and your ISP. In most organizations, proxies are configured by network admins to filter and/or monitor inbound and outbound web traffic from employee computers. In this article, we’ll show you how to view proxy settings (if your computer is behind a proxy server).

What is a proxy port?

A proxy’s “port” is a number that refers to a specific virtual location on a computer. … Network administrators who set up proxy servers define port numbers and make those numbers available to people who wish to use their servers.

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