Windows Server 2008 R2,
We're using username and password over HTTP as authentication to the svn server and the Jenkins service is running as the same user.
Recently we upgraded the subversion plugin to v2.5 from v2.4.5 and this caused svn authentication to fail with the following error:
Diving deeper into the cause of this revealed that Jenkins no longer tries to login to the svn server using HTTP clear text authorization (don't know the real name for this) but now tries to use NTLMSSP. Jenkins seems to use the correct username using NTLMSSP but the authentication fails.