I installed the great personal Wiki Instiki some time ago and found it useful but recently it just stopped responding. It was one of those terrible situations where you don't use something for a while and install or changed something and after that can't use it anymore.
I'm still not sure what is the problem but I managed to get it working again today. Whenever I hit a tricky problem in Windows I always seem to solve it with a tool from the www.sysinsternals.com guys. This time I used TCPView.
TCPView allows you see which processes are using the network. I guessed that something was conflicting with Instiki so I deleted the processes that were using the network one by one until I got it working again.
Unfortunately, I didn't restart Instiki after every process that I killed, so I am not sure exactly which process was blocking it but I know that I can use it again and that it is a problem with another application.
To discover which program it is I need to reboot and then kill off each one in turn again and restart Instiki after each one. When I can use it, I will know which was the offending process. The top Candidates are the Windows Firewall, Trend Micro's virus checker or the Nortel SSLVPN program.