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Re: Apache webserver outage - need help with forensics



Did you do a traceroute or any other network diagnostic to make sure
that you were actually able to reach the server?  It sounds like a
networking problem...

Kristina

On 4/13/05, Bob Brennan <rbrennan96 gmail com> wrote:
> I have a server which went completely unresponsive today on port 80
> for 20 minutes and would appreciate any pointers as to what might have
> happened.
> 
> A bit of background:
> * FC3, Up2Date
> * The Apache webserver serves a dozen virtual websites
> * Sendmail + Dovecot + Squirrelmail for all sites
> * Spamassasin recently activated (yesterday)
> 
> The problem + observations:
> * All websites were inaccessible from 14:00 gmt to 14:20 today
> * The mailserver was running and responsive during that time
> * FTP was running and responsive during that time
> * telnet theServer.com 80 timed out with no connection during that time
> 
> What I checked:
> * all access_log and error_log for all sites - showed 5 users using
> the sites at the time but nothing unusual
> * no evidence of a DOS attack (that I could see)
> * no records of anything unusual in system logs
> * no accesses or errors in any of the http logs during that time
> 
> Thankfully the webserver came back as if by magic after 20 minutes and
> was immediately responsive.
> 
> Any insights into anything else I can check? Needless to say an
> embarassing incident for a webmaster who whould like to prevent it
> happening again.
> 
> Thanks in advance,
> bob
> 
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