Preventing Users from using any desk or Team viewer

Hello,

Thank you for contacting Sophos Community!

You may use the application filter to block such applications:

https://docs.sophos.com/nsg/sophos-firewall/19.5/Help/en-us/webhelp/onlinehelp/AdministratorHelp/Applications/HowToArticles/BlockApplicationsUsingApplicationFilter/index.html#add-rules-to-the-policy

 How to allow (or block) AnyDesk when using TLS Scanning 

Thank you so much for your answer, I did follow the guide but I have few questions that are not clear.

So when I go to the application filter section I created the new filter and set it to block these apps.

then in the default action is allow?

Also when I created a firewall rule and saved it weirdly the other security feature settings were removed and my network got blocked however this is not my question, my question is when I create the rule I should add the source and destination would that mean it is also filtering my network traffic and deny everything if I put any to any and block? I am worried to do this step now. What is wrong with my rule?

Thank you so much for your answer, I did follow the guide but I have few questions that are not clear.

So when I go to the application filter section I created the new filter and set it to block these apps.

then in the default action is allow?

Also when I created a firewall rule and saved it weirdly the other security feature settings were removed and my network got blocked however this is not my question, my question is when I create the rule I should add the source and destination would that mean it is also filtering my network traffic and deny everything if I put any to any and block? I am worried to do this step now. What is wrong with my rule?

Hi,

you will also need to disable the default web exception for Teamviewer.

Ian