Jin Chen writes:
.... The only thing is our system administrator reboot the NT machine and the zope start.bat retarted looks like the normal. But the zope was not work. And It is very interesting, after I restarted the zope several times, it finally worked last day. I really don't know what happen and am afraid it will happen again. Do you have any experience at that? No, I do not work under Windows.
The mailing list archives have some similar threads (not that many). Reasons have been: Networking/DNS problems: in some cases, Zope maps IP-addresses to Hostnames. This is a DNS query which can be very unpredictable. Once, a virus checker has been responsible slowing the the machine in an incredible way. Once, it was an email message generated in "standard_html_message". The connection to the email server hang. The Zope owner was unaware that "standard_html_message" was called (it was for an "Unauthorized" exception. Usually, you do not see the error report). Of course, there are much more potential reasons. Dieter