blog posts

If you are thinking about maintaining the security and performance of your main website server, you can implement many security solutions by configuring Reverse Proxy in a Windows IIS server.

Setting up a reverse proxy in IIS is completed in 3 main steps: installing url rewrite and ARR plugins, creating a reverse proxy rule, and activating the Reverse Proxy settings in IIS, but this simple process can have a great impact on the security, performance, and traffic management of your website. have

Reverse proxies act like an interface and are placed in front of the webserver to communicate with users instead of the main server and intercept their requests at the edge of the network. Then, it acts as a mediator and forwards these requests to the main server, and receives the corresponding response.

In general, using a proxy server is associated with many advantages, such as balancing the site’s load and traffic, protecting the server from attacks, keeping content in the cache, and SSL encryption are the main ones that most website owners use to improve their site’s performance. They are looking for these benefits. If you are one of these people, you can safely set up Reverse Proxy.

So, if you use Windows Server and have chosen IIS to create, configure, and publish your site on the web, you can easily complete the process of installing and configuring Reverse Proxy in IIS by following the steps that we will review below. let the.

After this, there is no need to worry because even though this process has its difficulties and can be associated with many challenges, but with our step-by-step guide, all these difficulties will be eased, but if you intend to buy a Windows server that has the potential and power necessary to host a website and set up a reverse proxy, we recommend that you visit the Windows virtual server purchase page and order your ideal plan.

Table of Contents

• What is reverse proxy?
• Steps to set up reverse proxy in IIS
• Benefits of Configuring Reverse Proxy on Windows Server IIS
• Important points about setting up a reverse proxy in IIS

What is Reverse proxy?

The proxy server is an important point of computer networks that is responsible for mediating between the client and the server, and this intermediary is located in the server section.

Let’s go ahead with a real-world example:

Suppose you are an employee of a large company and your company has a sensitive security system. To enter the office, rookies and new employees must first pass through a special entrance door that is monitored by a security guard (reverse proxy).

This is a proxy server that manages requests and performs the necessary actions in the field of responding to requests, such as intercepting requests and directing them to the main server.

In general, this proxy performs several tasks in the field of improving the performance and security of the network. Mediation between client and server, network load reduction, content filtering, privacy protection, performing security tasks, and access control are the most important of them.

By performing these tasks, this server helps to create a secure, controlled and better-performing network environment.

Steps to set up reverse proxy in IIS

To use IIS as a reverse proxy, you must use a Windows Server 2019 and above and have gone through the steps of installing the IIS web server.
Step 1: Install the required plugins

IIS web server is not equipped with reverse server routing feature by default and you need to enable it. For this, you need to download and install a series of plugins manually.

One of these extensions is ARR (Application Request Routing), which is necessary to distribute web traffic between several servers, and to install it, just go to the ARR download page and download and install its file.

The second plugin is url-rewrite and it allows IIS to act as a reverse proxy server. To install this plugin, just go to the URL-rewrite download page and download and install its file.

If you open the IIS web server after downloading and installing the plugins, you can see the Application Request Routine Cache and URL Rewrite options in the IIS dashboard.

 

Step 2: Add a reverse proxy rule

Now you can add the rule for adding the proxy server. So click on the URL Rewrite option.

From the right bar, click on the first option of the Actions section, i.e. add rules.

 

 

Then select Blank rule from the inbound rules section and click on Ok.
You will see the following window:

 

First, enter the name of this rule in the name field.

Then, enter a pattern in the pattern section. This pattern is in regex format and is used to define how incoming reverse proxy requests are handled, or indeed, routed.

If you want this pattern to match all site URLs, set the pattern to (.*). Or, for example, to set this routing to apply to all urls starting with myapi, enter the pattern as (*.)/myapi.

* If needed, you can use the test pattern tool available next to the pattern field to test your desired patterns.

If you need to specify a series of specific conditions for the templates section, you can optionally use the Conditions section.

When you reach the Action section, you must determine the desired action or activity when matching the pattern.

In this way, if the requested URL is compatible with the pattern you specified in the pattern section, what path will the desired URL be directed to.

Step 3. Enable reverse proxy settings in IIS

As we mentioned earlier, the reverse proxy feature is not enabled by default in IIS and you have to manually enable the IIS proxy settings. If you do the settings of step 2 and do not enable this feature, users and you will encounter a 404 Not Found error when visiting the address. For this, just follow the steps below:

Open IIS Manager and click Server.

Double click on Application Request Routing option.

 

 

From the right toolbar, click Server Proxy Settings.

Then, check the Enable proxy option to enable this feature on the web server.

Then set the HTTP Version to Pass through and check the Reverse rewrite host in response headers option.

 

Finally, click Apply to save the change.

Yes, by following these steps you have succeeded in setting up a reverse proxy in IIS.

Benefits of Configuring Reverse Proxy on Windows Server IIS

Load balancing

A popular website attracts millions of users daily and may not be able to handle all incoming server traffic. In such cases, the site can be distributed among a set of different servers that manage requests related to a website. This is where a reverse proxy can be used as a load balancer to distribute incoming traffic evenly between different servers. This work not only prevents the overload of the main server and selects the closest server when responding to requests, but if one server fails, other servers can act as an alternative to traffic management.

Protecting the server from attacks

With a proxy server, there is no need to reveal the IP address of the origin servers. This makes hackers unable to identify the target and execute attacks such as DDoS.

cache memory

A reverse proxy can store content in its own cache and, if needed, use the cache to increase the speed of responding to requests.

SSL encryption

Encrypting or decrypting communications for each client can be expensive for the main server. A proxy server can be configured to encrypt all incoming requests and outgoing responses, freeing up valuable primary server resources.

Now that you are familiar with the main functions and benefits of a proxy server and have learned how to configure Reverse Proxy in Windows IIS Server, it is time to start setting up Reverse Proxy based on the following tips.

Important points about setting up a reverse proxy in IIS

• Ensure that the servers are ready to receive traffic from the reverse proxy.
• Don’t forget to enable the TLS certificate for the reverse proxy.
• Enable client-side authentication.
• to the pattern *. Don’t settle and try using different mechanisms for things like authentication and return URLs.
• For each specific case, create separation rules and don’t forget to activate the Stop processing option because this option prevents conflicting urls compatible with multiple patterns.
• Your rewrite is not limited to the root folder of the site and you can send or redirect the input URL as a parameter.
• If you have SSL certificate enabled, using the http prefix in the rewrite URL will add SSL to your reverse proxy. But if you want to keep the encryption, you should add a new condition under
• the format ://?(https)^ from the condition section and start the rewrite URL with //:{C:1} prefix.
• Check the reports on the reverse proxy to make sure it is working properly.
• If you are using multiple destination servers for reverse proxy, make sure that the traffic is properly distributed between them.
• Do the necessary optimizations and updates to avoid security problems.

Conclusion

By configuring Reverse Proxy in Windows Server IIS, you can create a gateway between your clients and your main servers so that requests can be handled and managed through it. This process is completed in several steps, the most important of which are installing the necessary plugins, creating a reverse proxy rule, and activating it. If you set up this proxy correctly and perform SSL certificate and authentication carefully, you can expect to improve the performance and security of your site.