This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
So you're getting connected and you're getting a response. And the response is, there was an error on server B. The thing to do now is to go over to server B and look in its logs to find out what that error was.