TeamViewer 9 fails to connect with error: "No connection to TeamViewer server"
Last Updated January 25, 2019
TeamViewer 9 is configured to make an explicit connection to the ProxySG.
Upon connection attempt, the application displays the error: "No connection to TeamViewer server"
No connection to TeamViewer server
TeamViewer 9 uses the CONNECT protocol with non-TLS compliant SSL.
In a policy trace, you will see the proxy generates the error "EXCEPTION(connect_method_denied): CONNECT with a protocol other than SSL is not permitted"
We need to add CPL code to tell the proxy to allow the CONNECT requests which are using non-TLS compliant SSL. We need both rules because TeamViewer 9 will make CONNECT requests to *.teamviewer.com domains and to IP addresses.