After upgrading to 2.0, our authenticated TeamCity NuGet feed disappeared from the list and no projects were able to see any post-upgrade builds. Attempting to recreate the feed threw an error message saying that a feed with that name already exists. Checked RavenDB and that was indeed the case, however I noticed that the password was set to null. I recreated the feed with a different name, then copied the password element to the original feed and they both showed up, so I just deleted the copy after verifying that all projects once again had access.