Visual Studio Error: (407: Proxy Authentication Required)

Question

I am behind a corporate proxy server which requires credentials. I have been trying to connect to a TFS server (on tfspreview.com) with MS Visual Studio Pro 2012

Answer 1

After three days of searching, the solution fell into my lap.

Now, what happened was VS tried to do an automatic update but was stopped by the proxy. I was prompted for credentials and the check took place.

I was inspired to check the TFS server connection just for kicks in case that prompt would possibly establish a connection for the TFS server to tunnel through... lo and behold! It worked!

WORKAROUND:

1. Open TOOLS>Extensions & Updates
2. Click on Updates... in the left-hand menu
3. There will be a failure notice on screen and a link to enter your credentials. Click it and enter them.
4. Close the Extension manager.
5. Click TEAM>Connect to TFS server...
6. Enter the address and it will work!

Note: Some have suggested trying to use the proxy credential prompt by opening the integrated browser but this has not worked. I am not an expert but I think they are connecting through different channels within windows itself.

There is no editing of devenv.exe.config required for this to work.

It will be a pain to have to check for updates manually every time you need to connect to the server, but this is the best solution I have come up with until Microsoft fixes this issue permanently with an update or future release.