Codeplex: cannot log in with Visual Studio

I'm trying to login to Codeplex's TFS server using visual studio 2015. I've done this in the past, and it has always worked.

Now however, I changed my PC and on my new visual studio installation I cannot login with the login info they provide.

Basically, whenever I try to log-in, visual studio keeps showing the login popup again and again, without any error message.

The credentials are correct, I double and triple checked them.

Any ideas?

You can try below ways to figure out the access issue:

• Clear the user and password info stored in Windows Credential (Control Panel-Credential Manager)
• Disable the firewall and antivirus software
• Clear TFS and VS cache
• Log out your account in the old machine and try again
• Make sure that you have selected Visual Studio Team Foundation Server for source control. To do this, go into the Visual Studio options menu and select Visual Studio TFS as the Current source control plug-in. Then, select Tools Options- Source Control - Plug-in Selection.
• If you are still having trouble, try going through the “Forgot Password” link to reset your password. (Note: you need to use Forgot Password, and not the normal Change Password option). Try connecting again.