NBAR can also be used at a router level to block traffic for a specific application. There is a couple of ways that you can block / allow Teamviewer specifically through Cisco ASA and the Firepower (IPS/IDS) module. To deny connections from outside your network, only allow incoming LAN connections. Choose between Full access, Confirm all, viewing access or deny any incoming remote control connection. To restrict features for incoming connections, use the access control for incoming connections. Deny incoming connections for specific TeamViewer IDs or only allow connections for defined TeamViewer-IDs. To restrict access to ordained devices, use the Black- or Whitelist in the TeamViewer full version. To completely prevent any access with ID and password, exit TeamViewer in the taskbar.Īny incoming or outgoing connections are no longer possible. Depending on how you want to restrict access and to what extent, choose one of the following options: You can also restrict access to your computer in different ways. I think this article from TeamViewer is what are you looking for: How can I restrict access for TeamViewer connections to my computer? To achieve your goal, you should use TeamViewer's way. You make a connection to a Teamviewer ID, and TeamViewer passes the connection down through the TeamViewer client's established tunnel to the destination and you then you are prompted for password and then the connection establishes afterwards. When you run TeamViewer, you are assigned an ID on their broker server. You can see the answer of kobaltz for the question How exactly does a remote program like Team Viewer work? TeamViewer users connect each other by using a third party server in the middle. When you connect someone with TeamViewer, you don't do it directly. I don't think you can do this with firewalls, at the networking layer.
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