[FYI] Apache behind an IIS Reverse Proxy

[MichaelR]

Hey,

I have OTRS installed on a server on the network, and have seperate IIS server that is our web server. I have installed the Reverse Proxy & ARR stuff, and set up the reverse proxy
Now it looks to be working ok, links work, logins work, all good!

Only issue is, if I click on a link twice really quickly (it sends off 2 requests to OTRS before it has a chance to answer), IIS throws a 502 Bad Gateway error because supposedly Apache has thrown an error...
At the exact same time, Apache throws these errors and restarts a child process?

Code: Select all

ModPerl::Util::exit: (120000) exit was called at C:/PROGRA~2/OTRS/OTRS/Kernel/cpan-lib/CGI/Carp.pm line 561
[Wed Apr 06 15:58:22 2011] [notice] Parent: child process exited with status 255 -- Restarting.
[Wed Apr 06 15:58:24 2011] [notice] Server built: Oct 18 2010 01:58:12
[Wed Apr 06 15:58:24 2011] [notice] Parent: Created child process 2436
Scalars leaked: 1 Scalars leaked: 1 Scalars leaked: 1
[Wed Apr 06 15:58:28 2011] [notice] Child 2436: Child process is running
[Wed Apr 06 15:58:28 2011] [notice] Child 2436: Acquired the start mutex.
[Wed Apr 06 15:58:28 2011] [notice] Child 2436: Starting 64 worker threads.
[Wed Apr 06 15:58:28 2011] [notice] Child 2436: Starting thread to listen on port 80.

Looking at the section of code in Carp.pm and a bit of googling, I learnt that the code deals with content-lengths when replying to a request.
Now not knowing the damage this could cause, I commented out the block of code, and whola! IIS/Apache doesn't throw errors/quit when you double click a link within OTRS really fast.

The lines I commented out in the file (OTRS/Kernal/cpan-lib/CGI/Carp.pm) are

Code: Select all

if ($r->bytes_sent) {
  $r->print($mess);
 $mod_perl == 2 ? ModPerl::Util::exit(0) : $r->exit;
} else {
  # MSIE won't display a custom 500 response unless it is >512 bytes!
  if ($ENV{HTTP_USER_AGENT} =~ /MSIE/) {
    $mess = "<!-- " . (' ' x 513) . " -->\n$mess";
  }
  $r->custom_response(500,$mess);
}

Let me know if anyone has a proper solution to this, knows if there needs to be any configuration to Apache/Perl to get it to run behind a ReverseProxy, or just has any feedback!


Cheers,
Michael

[gumboot]

I was having this problem, constantly getting "This page could not be found" and hit refresh and carry on.

Commenting out these lines has made the problem disappear.

Cheers

[MichaelR]

Yeah, it seems as OTRS does a few sanity checks that it has sent the right amount of bytes or something like that. And because it's behind a proxy, that makes it all go down in a giant fireball.

Glad it helped

[MichaelR]

A weird error I had recently, which might or might not be related to this code change:

I was changing a value in sysconfig, and double clicked on the Submit button at the bottom. This somehow caused OTRS to blank out half my ZZAuto.pm file and blow everything up!

[guillo]

So I'm experiencing the same error here... also behind a proxy but diffrent configuration. I'll be checking this out and post my results.

You are saying that the OTRS deleted half your zzzauto file??????