Shai Berger writes:

We've repeatedly encountered a weird situation where Zope gets stuck. Then, when we kill one of the Zope processes, it is released and answers requests. We see something similar once in a while (about once in 6 month):

* Zope stops serving requests: processes are there, no memory problem, no time consumption * Zope 2.1.6 on Solaris 2.7 We do not know what causes the problem. As it happens very rarely, we do not care much. Dieter