Currently TeamCity redirects to the login page because publish request is not authorized:
[03:31:43][Step 7/7] Publishing package to feed at http://localhost/guestAuth/app/nuget/v1 ... vice.svc...
[03:31:50][Step 7/7] Failed to push to package feed at http://localhost/login.html/. The package feed was not found.
Enabling guest access specially for this purpose is not acceptable.