Block teamviewer pfsense


  • Virtual IT Support
  • Reverse proxy with pfSense and Squid
  • How to allow ping on pfSense firewall?
  • TeamViewer Security Risks And How To Mitigate Them
  • Virtual IT Support

    A virtual machine with pfSense freeBSD installed A WAN interface configured on the pfSense A LAN interface configured on the pfSense, most likely a virtual Switch on your hypervisor Before we can dive into the reverse proxy settings, we first need to install the service in pfSense, and, while there are for sure other proxy tools offering the same functionality, I went for Squid. For the purpose of this exercise, I left the default settings, but in view of accelerating the performance of the web servers you are configuring reverse proxy for, this is where you would tweak the caching settings for Squid to speed up your website.

    Logically, looking at reverse in reverse proxy, this will be the WAN interface of your pfSense. Apart from more advanced setups, this is most likely going the be the standard ports 80 and However, as usual, ports below are reserved ports, and Squid will give you an error when trying to save the settings under the General tab.

    Only the net. For HTTP reverse proxy the settings are quite straight forward, just enable the service and add port 80 or any custom port your clients are connecting to for HTTP.

    Really cool stuff, I promise you! For the purpose of this exercise I installed a Jamf Pro server on a VM internal side of the pfSense , and just for the fun of it changed the port to This will catch and evaluate the URL the client is connecting to, compare it to a list of criteria and link the user to the correct backend web server or peer.

    In my case here my on-prem Jamf Pro server. Give your mapping a name and description and select the relevant peer this mapping should be linked to. Hit save and done! Or actually, almost! As always, if you like this post hit the like button, leave a comment, and tell your friends about this blog by using the sharing buttons down below.

    These instructions should protect you against all usage of this common remote desktop application. TeamViewer requires no configuration or any special firewall rules to allow it to connect.

    All a user need to do is to download the EXEs from the website and run them — this makes it very easy for anyone to setup and to circumvent security restrictions. With such an easy installation process, how do you block TeamViewer? Step 0: Policy Ensure you are entitled to block this application and your end-users are aware of your corporate policy against this sort of access. You should always have written policy to back up these enforcements.

    Do nothing else. This removes the possibility of the TeamViewer client checking DNS records against their own servers, instead of yours. This means clients will now only be able to resolve the DNS records you allow through your own DNS server and these servers can forward requests on to external servers, of course.

    To overcome this, you need to block access to their IP Address range. Log into your Firewall or Router Add a new outgoing firewall rule to disallow connections to Close those windows and link your new GPO to the domain and make it apply to everyone. These devices are specifically trained to look for common remote access tools and block them.

    They also cost a lot of money. These steps should help you reliably block TeamViewer on your network. This protects you against users trying to gain remote access to your network using this software, or getting to their own PCs at home to circumvent filters.

    It is worth checking your setup regularly to ensure it is still functioning as expected, as the ports and IP Addresses may change in the future. You should also apply similar restrictions to all of the other common remote access tools. When it comes to security, you can never be too sure.

    On this page.

    Apart from more advanced setups, this is most likely going the be the standard ports 80 and However, as usual, ports below are reserved ports, and Squid will give you an error when trying to save the settings under the General tab.

    Reverse proxy with pfSense and Squid

    Only the net. For HTTP reverse proxy the settings are quite straight forward, just enable the service and add port 80 or any custom port your clients are connecting to for HTTP. Really cool stuff, I promise you! Another more recent example allows phishing attacks to take control of the target machine How to Make TeamViewer More Secure?

    How to allow ping on pfSense firewall?

    TeamViewer is fine when attended, i. But because it runs in the background, the target machine can be taken over at the absence of a human observer. Look for TeamViewer usage across the organization — you may have a VPN, but some employees might still ignore general recommendations and run TeamViewer.

    You can detect TeamViewer usage by collecting traffic logs e. All of that can typically be achieved through a properly configured SIEM.

    TeamViewer Security Risks And How To Mitigate Them

    It generates several types of logs, including connection logs, so those should be collected e. That reduces the risk of machine takeover by leaked credentials Configure whitelists — often you know where you are going to need access from.

    This means clients will now only be able to resolve the DNS records you allow through your own DNS server and these servers can forward requests on to external servers, of course. To overcome this, you need to block access to their IP Address range. Log into your Firewall or Router Add a new outgoing firewall rule to disallow connections to Close those windows and link your new GPO to the domain and make it apply to everyone.

    These devices are specifically trained to look for common remote access tools and block them. They also cost a lot of money.


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