[Zope] Zope hangs!

Hi. I'm stuck to find why my Zope server sometimes hangs. STUPID_LOG_FILE sais me nothing (just no any error), Zope processes/instances are sleeping, host pings fine, but if you try to connect to the Zope with a simple browser -- just timeout and "bye-bye". What I need to switch on to debug this annoyance? After Zope restart (in console) all works fine. -- Regards, Bogdan "[In 'Doctor' mode], I spent a good ten minutes telling Emacs what I thought of it. (The response was, 'Perhaps you could try to be less abusive.')" (By Matt Welsh)