I'm having similar issues. I have 5 computers. 4 work great but there is one that is very hard to connect to or I keep getting the same error. I can log into the 4 other computers from the the problem computer with no issues its just when trying to log on to this one computer from any of the other four is the problem.
2 PC's are Vista and 3 are XP. The problem one is XP.
I can send log files, just let me know from which computer(s) and how to do it.
I have totally the same stupid situation. It is exactly the same problem, but I got the following devices:
1 XP Home
2 XP Professional
1 XP Server
1 Android client
And the problem is with XP Server. I cannot be connected TO XP Server sometimes, and sometimes I can. But I can connect to any PC FROM XP Server anytime.
What is interesting: Firewall on XP Server is turned OFF and it is located in the same local network with 1 XP Professional and 2 Win7, which works great.
I already sent my log files to your tech support, but they couldn't find anything wrong in logs.
What could be the problem?