[CentOS] Not firewall, but what?

Thu May 6 19:00:40 UTC 2010
Benjamin Franz <jfranz at freerun.com>

On 05/06/2010 11:42 AM, Ryan Manikowski wrote:
>
> Notice the op posted they get timeouts even when going directly to a 
> numerical address (if the apache server is configured to respond to 
> *:80 it should at least display something)
>
> Try using telnet from a client machine that can not connect.
>
> e.g. telnet host.name.here 80
>
> or
>
> telnet xx.xxx.xxx.xxx 80
>
> Try a few times and see if you're getting a timeout or if it connects 
> every time. Run tcpdump on the apache server while sending the 
> connection requests and see if the connection attempts show up at all. 
> If they do not, then it's a network problem.
>
Try running 'ab' (the apache bench tool - see 'man ab' for how to use 
it) against your server and see if you can provoke the timeouts. If you 
can, then you are probably not configured to handle many quick 
connections and should check (1) httpd.conf to make sure you don't have 
an excessively low setting for 'MaxClients' or (2) a too low setting for 
max open filehandles. Look in /etc/security/limits.conf - you should 
have a line reading something similar to:


*                -       nofile          64000


somewhere in it to raise the max number of open files. Busy web servers 
need lots of filehandles.

-- 
Benjamin Franz

-- 
Benjamin Franz

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