MicrosoftI had a Case at a Customer where Desktop sharing with External users was constantly failing. All other modalities worked fine. We also checked ports, etc. several times. In the end I took a Network trace from an internal Client Machine. It turned out to be an issues with a security product they were using. All requests to TCP port 443 (remember: Desktop Sharing uses TCP 443) were redirected to a Proxy Server - regardless of Proxy Settings in the browser, etc. After we configured an exception in the security product to allow tcp 443 traffic to Edge Servers without a Proxy, everything started working... Just my 2 Cents, Cheers Christian
