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Hi, Regrettably it's not a specific platform thing - Solaris 8 + MySQL + 5.5.0 L1 does it too, but not as much as you've reported. No answer that I can see on the BB knowledgebase. I think that if the problem lies anywhere, it's Apache and it's MacClients, but if you've already bootsed that, I'm at a loss. Anyone else got an idea? Tim Herta Van den Eynde wrote: > Environment: linux + oracle + bb 5.5.1 level3 > > Does anyone know what causes the "500 - Internal Server Error" messages in > blackboard? They're usually short lived, so if the user waits a few seconds > and hits the reload button, he usually is OK again. > (On linux you can count the errors by means of the following command: > # grep " 500 " /usr/local/blackboard/httpd/logs/access_log | wc -l > We're getting anywhere between 400 to 900 a day.) > > I've browsed Blackboard's support pages. They are aware of the problem, but > don't seem to have a clue as to what causes it. > > Initially I thought it might be a resource problem, so I bumped up Apache's > MaxClients in httpd.conf, and increased the Oracle listener queue. All to > no avail. I've checked bbuser process limits, system wide maximum number of > tasks, monitored the system, but there are no apparant bottlenecks. > > Any ideas? > > Herta