Connectivity to TFS fails - NTLM Negotiation not completed

Question

Hello,
I'm having a strange issue trying to connect my Visual Studio 2013 Pro to TFS. The connectivity works fine on all of the other machines I've tried, so it appears to be a client side issue with VS.
We have a locally hosted instance of TFS which I can connect to with no problem if I use the IE web version, but if I try to connect with VS it tells me that: "TFS1003: Either you have not entered the necessary credentials or your user account does
not have permission to connect to the Team Foundation Server." and "TF30063: You are not authorized to access". It does this without even prompting me for login details, as I would expect.
I have tried all of the usual suggestions of clearing cache in IE, reinstalling VS etc with no progress.
Upon further investigation with Fiddler, it seems that Visual Studio is not even attempting to complete the NTLM negotiation. It receives the initial 401 response but then does not attempt to send any authentication details.
The issue I am seeing is very similar to the NuGet problem described here: http://blog.rthand.com/post/2011/08/26/Fixing-combination-of-NuGet-and-Team-Foundation-in-workgroup-configuration-401-Unauthorized.aspx - but the solution listed there of adding
TFS to the intranet sites list does not fix it.
If I use the Web Browser view within TFS I am able to replicate the same behavior: I receive a 401 error without attempting to send credentials. However, opening the site in IE on the same machine works fine.
How can I force Visual Studio to complete NTLM auth?
Thanks!

Answer 1

Hi Jamie,
For your scenario, you can try to clean the Cache for TFS manually(delete the content of the folder only, not the cache folder itself):
Clean the Cache folder on client computer. The folder path is: C:\Users\username(Team Explorer user name)\AppData\Local\Microsoft\Team Foundation\5.0\Cache. (os: Windows Server 2008 R2)
Clean the Cache folder on Server machine. The folder path is: C:\ProgramData\Microsoft\Team Foundation\Web Access\Cache_v11.0. (os: Windows Server 2008 R2)
 After cleaned, on Server machine, click Start and select Run… to open the dialog box, then input iisreset.exe and click OK, wait it run completely.
Also sign out all the applications which authenticated with MS account. Delete the credential used to connect to TFS in credential manager and try again. Check whether you use windows authentication if it not works for you. Another option is repair your
Visual Studio to make sure it was intalled correctly. If the problem still exist, elaborate more details about your scenario.
Best regards,
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