The symptoms of the problem are as such:
Every once in a while, zope stops responding for a few minutes ... Sometimes it comes back on it's own, sometimes it takes too long and I restart it manually. We have seen similar behaviour (Zope 2.5.1, Solaris 2.5, Apache+FastCGI) as long as we used FastCGI.
We switched from FastCGI to "mod_rewrite" with "[P]" rewrite rules and the problem disappeared.
The placed I used to work saw this all the time using PCGI and mod_pcgi2. Usually happened on hosts with a reasonable amount of traffic. We managed to track down a few instances of the hangs to large file uploads, a few others to just bad programming in our products, and atleast 1 instance to broken threading on FreeBSD 4.3, but that was fixed in later releases. Never completely solved all the hangs though. -- Jamie Heilman http://audible.transient.net/~jamie/ "...thats the metaphorical equivalent of flopping your wedding tackle into a lion's mouth and flicking his lovespuds with a wet towel, pure insanity..." -Rimmer