How To Block Spammers/Hackers With mod_defensible On Apache2 - php problem

Discussion in 'HOWTO-Related Questions' started by le_avion, Jul 13, 2008.

  1. le_avion

    le_avion New Member

    My server is running Ubuntu 7.10 and I ran into a problem after installing and configuring mod_defensible. The problem that I ran into is that my php pages are no longer handled by the server and instead my browser offers to download the page php source.

    In Apache's error.log I see the following which is probably related:

    apache2: udns_resolver.c:477: dns_free: Assertion `ctx != ((void *)0) && ctx != &dns_defctx' failed.
    [Sun Jul 13 12:06:00 2008] [notice] child pid 7803 exit signal Aborted (6)

    I wonder what is the reason for this problem.

    Avi
     
    Last edited: Jul 13, 2008
  2. falko

    falko Super Moderator ISPConfig Developer

    And when you comment out the three mod_defensible directives and restart Apache, PHP works again?
     
  3. le_avion

    le_avion New Member

    This is correct. When I comment the lines out PHP starts working again.

    Avi
     
  4. falko

    falko Super Moderator ISPConfig Developer

    Hm... What's in /etc/resolv.conf?
     
  5. le_avion

    le_avion New Member

    search cfftechnologies.com
    nameserver 192.168.129.1
    nameserver 68.87.72.130
    nameserver 68.87.77.130


    The first name server is my own caching name server.

    Avi
     
  6. falko

    falko Super Moderator ISPConfig Developer

    Can you try this in the first place in /etc/resolv.conf?
    Code:
    nameserver 145.253.2.75
     
  7. le_avion

    le_avion New Member

    First I would like to thank you for trying to get my issue resolved.

    This did not help but I did get it working properly now. Seems that the version of mod_defensible in Ubuntu 7.10 has a bug. I found a reference to the same problem I am having in a Debian bug report. I ended up installing the newer libudns0 and mod_defensible from Hardy (Ubuntu 8.04) and that fixed the problem. I will file a bug report with Ubuntu and ask them to back port it to 7.10 since it is still a supported version. From the Debian bug report:

    libapache2-mod-defenisble has a serious issue involving dns resolution in
    the testing tree. Anytime you activate and use the module the following
    critical error is thrown by Apache:

    [Mon Sep 17 10:48:25 2007] [notice] child pid 30877 exit signal Aborted (6)

    apache2: udns_resolver.c:477: dns_free: Assertion `ctx != ((void *)0) && ctx
    != &dns_defctx' failed.

    This is a blocker issue that prevents Apache from serving any requests while
    the module is activated.
     

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