Internal Server Error on Nagios 2.0

[Pete Shelfo]

I found the answer!!!  Unfortunately installing Nagios via the RPM did
not help.  The problem lies within SELINUX.  If I disable SELinux the
CGI scripts work fine.

/etc/selinux/config 
SELinux=disable
Reboot the server

Now the question is why does the security enhanced Linux module cause
problems with the CGI scripts?  I value a secure Linux server so I am
off to research some more.

-----Original Message-----
From: Jim Perrin [mailto:jperrin at gmail.com] 
Sent: Tuesday, February 21, 2006 11:19 AM
To: Pete Shelfo
Cc: nagios-users at lists.sourceforge.net
Subject: Re: [Nagios-users] Internal Server Error on Nagios 2.0

> I recently tried to fire up a new Nagios server running on RedHat 4
> Enterprise (fully patched).  Everything works fine, pre-flight passed,
http
> is correct, web page displays; however, whenever I access a CGI link
on the
> left hand page I get the following error:
> "Internal Server Error
>  The server encountered an internal error or misconfiguration and was
unable
> to complete your request.
>  Please contact the server administrator, root at localhost and inform
them of
> the time the error occurred, and anything you might have done that may
have
> caused the error.
>  More information about this error may be available in the server
error log.
> I have tried and tried to troubleshoot the problem but have had no
success.
> 1.      I have searched the forums, google and apache.  It appears
this is a
> common problem across many Linux platforms
> 2.      I have chmod 777 /usr/local/nagios permissions fully with no
success
> and added every userID I could like of to the group.
> 3.      I have even tried a default configuration with one host, a
check
> ping and along with all the sample configs.  The problem still occurs.
> 4.      I have verified my http conf and tried all types of
suggestions I
> found during my searches.
> My http config error log displays the following:
> Tue Feb 21 10:43:50 2006] [error] [client 10.1.7.200] Premature end of
> script headers: status
> .cgi, referer: http://servername/nagios//side.html
> I am currently running Nagios version 1.1 with no issues.  This really
looks
> like an incompatibility with Apache or CGI or something?  Anyone have
any
> ideas - I am flat out?


Your permissions or authentication via website is not correct
(REMOTE_USER isn't being set). For RHEL systems, using the rpms
provided by dag make things much easier, as the permissions etc are
done for you. All you're left doing is adding users to the web
authentication setup he provides and configuring services, or changing
his auth to whatever auth system you use in your env. They work very
well.

--
"They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety''
Benjamin Franklin 1775


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