I'd running the latest Jenkins on Windows Server 2008. I have the latest git plug-in (2.0). I'm attempting to add a connection to Visual Studio Online to a repository that has a space in the name and the plug-in is reporting that it is an invalid URL. Using the same URL from a git command line works fine.

Here's an example:

https://mydomain.visualstudio.com/defaultcollection/_git/My%20Project