[jobediah]

Not really, only things like "File does not exist: ".
When starting Apache it logs "server reached MaxClients setting, consider raising the MaxClients setting". I already tried to raise this setting, but the message doesn't disappear. But it also doesn't appear when not being reachable.

What would you advise for MaxClients Setting?

See my apache.conf:
<IfModule prefork.c>
StartServers 5
MinSpareServers 5
MaxSpareServers 10
MaxClients 20
MaxRequestsPerChild 0
</IfModule>

# pthread MPM
# StartServers ......... initial number of server processes to start
# MaxClients ........... maximum number of server processes allowed to start
# MinSpareThreads ...... minimum number of worker threads which are kept spare
# MaxSpareThreads ...... maximum number of worker threads which are kept spare
# ThreadsPerChild ...... constant number of worker threads in each server process
# MaxRequestsPerChild .. maximum number of requests a server process serves
<IfModule worker.c>
StartServers 5
MaxClients 250
MinSpareThreads 25
MaxSpareThreads 75
ThreadsPerChild 25
MaxRequestsPerChild 0
</IfModule>

Regards,
Jobediah