A Zope server stopped responding to requests, with page requests just timing out, but fortunately (I thought) I had the debugger URL ready. However, when I loaded that I was amazed to see it load instantly, showing the usual 4 threads. I restarted Zope, and now the debugger shows only: Threads traceback dump at 2008-04-25 23:30:12 End of dump In Unix, I see the usual two Zope processes. Their CPU usage is very low. 17633 ? S 0:184640842280 0.0 0.3 /usr/local/bin/python /www/Zope-2.7.3b2-0/lib/python/Zope/Startup/run.py -C /ww 17632 ? S 0:00 8192 3768 0.0 0.1 /usr/local/bin/python /www/Zope-2.7.3b2-0/lib/python/zdaemon/zdrun.py -S /www/Z The event log has nothing unusual, and ends with "Zope Ready to handle requests" What can I do?