honeylesno.blogg.se - Teamviewer cannot connect to server

Add a new outgoing firewall rule to disallow TCP & UDP port 53 from all source IP addresses, EXCEPT the addresses of your own DNS servers.

This removes the possibility of the TeamViewer client checking DNS records against their own servers, instead of yours. Step 2: Check Clients Can’t Connect to External DNS ServersĮnsure the only DNS connections allowed on your network are to your own internal DNS servers (which contain this dummy-record). By pointing this record nowhere you will stop connections to this domain and all of it’s subdomains If you run your own DNS server (such as an Active Directory server) then this is easy.

The first step is to block the resolution of DNS records on the domain. You should always have written policy to back up these enforcements. With such an easy installation process, how do you block TeamViewer? Step 0: PolicyĮnsure you are entitled to block this application and your end-users are aware of your corporate policy against this sort of access. Corporate networks probably don’t want to allow such easy remote access. 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. TeamViewer requires no configuration or any special firewall rules to allow it to connect. These instructions should protect you against all usage of this common remote desktop application. We include information on the TeamViewer Port, IP Addresses, and DNS Records needed to block this application. Try the other methods on our list first before you resort to this step.This article explains how to accurately block all TeamViewer remote connections on your network. However, the drawback is that they are expensive. These features are specifically designed to look for common remote access tools and block them.

If nothing outlined has helped you so far you might need to use a firewall that does Deep Packet Inspection and Unified Threat Management.

Connect your new GPO to the domain and apply it to all of your customers.

Choose "Browse" in the New Hash Rule window that will be displayed.

Right-click the Software Restriction Policies and select "New Software Restriction Policies".

They can be found under User Configuration > Windows Settings > Security Settings > Software Restriction Policies.

Navigate to the Software Restriction Policies in your new GPO.

Launch the Group Policy Management Console, and generate a new GPO.