Answer for your First question is 'no'. There is no possibility to customize this behavior.
Your Second question is interesting. 401 response you get because it look like you trying to connect https:// protocol with invalid password.
But I'm not sure why system generate wrong credentials for you.
Have you in log files message like: ?
ERROR c.s.o.logic.update.UpdateCheckLogic line:134 getKeyManagers - problem loading keymanagers for client authentication
Can you attach log file, so we can troubleshoot this issue? (http://thwack.solarwinds.com/docs/DOC-170983)