You should run strace (or truss) on the httpd and see where the hang is. In order to get one process, run 'httpd -X' if you use prefork; worker respects -X but in a different manner - one process with many threads - not as helpful as prefork in ONE_PROCESS/NO_DETACH mode.
Aren't you using mod_auth_ldap? Couldn't it be blocking on LDAP? --
Oops - after some sniffing on the network, it turns out to be a squid problem and thus completely unrelated. My bad...!
Regards,
Graham
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