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Enabling IIS Basic Authentication invalidates using Personal Access Tokens

TFS 2017 | TFS 2015 | TFS 2013

We recommend you keep IIS Basic Authentication turned off always when using Azure DevOps Server. Only if necessary should you enable IIS Basic Authentication. When IIS Basic Authentication is enabled on your windows machine, it prevents you from using personal access tokens (PATs) as an authentication mechanism.

For example, if you use a PAT to allow a third-party app to retrieve bug information, and then email that info to the bug assignee with IIS Basic Authentication enabled, then that app fails authentication. The app can't retrieve bug info.

Git with IIS Basic Authentication enabled

Warning

If you use Git with IIS Basic Authentication, Git breaks because it requires PATs for user authentication. Although we don't recommend you use IIS Basic Authentication, by adding an extra header to Git requests, you can use Git with IIS Basic Authentication.

The extra header must be used for all Azure DevOps Server installations, as Windows Auth also prevents using PATs.

The extra header must include a base 64 encoding of "user:PAT". See the following format and example.

Format

git -c http.extraheader='Authorization: Basic [base 64 encoding of "user:password"]' ls-remote http://tfsserver:8080/tfs/DefaultCollection/_git/projectName

Example

git -c http.extraheader='Authorization: Basic a2FzYW50aGE6bzN3cDVndmw2YXRkajJkam83Znd4N2k3NDdhbGxjNXp4bnc3b3o0dGQycmd3d2M1eTdjYQ==' ls-remote http://tfsserver:8080/tfs/DefaultCollection/_git/projectName