Article ID: 128366, created on Feb 17, 2016, last review on Jun 17, 2016

  • Applies to:
  • Plesk 12.0 for Linux
  • Plesk 11.0 for Linux
  • Plesk 11.5 for Linux


Cannot attach files in Horde, it is hanged in uploading state, the following error can be found in web server error log /var/log/httpd/error_log:

ModSecurity: Access denied with code 44 (phase 2). Match of "eq 0" against "MULTIPART_UNMATCHED_BOUNDARY" required. [file "/etc/httpd/conf.d/mod_security.conf"] [line "97"] [id "200003"] [msg "Multipart parser detected a possible unmatched boundary"] [hostname ""] [uri "/services/ajax.php/imp/addAttachment"] [unique_id "VqnL5FLCW54AAFFr8S8AAAAH"]
Invalid response status 44, referer: http://webmail.domain.tld/imp/dynamic.php?page=compose&type=new&token=ezPXeLIHVHukU0e-0C0PU7o&uniq=1453968345263


The root cause of the issue is that ModSecurity package installed from 3rd-party repository.


  1. Check ModSecurity package:

    # rpm -qa | grep mod_security
  2. Check vendor of this package:

    # rpm -qi mod_security-2.7.4-1
    Name        : mod_security                 Relocations: (not relocatable)
    Version     : 2.7.4                             Vendor: PowerStack
    Release     : 1                             Build Date: lun 10 jun 2013 23:02:52 CEST
    Install Date: miИ 10 jul 2013 13:56:21 CEST      Build Host: centos-5-amd64

    Modsecurity packages provided by Plesk looks like the following packages, e.g.:

  3. As a workaround comment security rule which causes the issue in '/etc/httpd/conf.d/mod_security.conf':

    # grep 'MULTIPART_UNMATCHED_BOUNDARY' /etc/httpd/conf.d/mod_security.conf
    #SecRule MULTIPART_UNMATCHED_BOUNDARY "!@eq 0" "id:'200003', phase:2, t:none, log, deny, status:44, msg:'Multipart parser detected a possible unmatched boundary'"
  4. Restart apache service:

    # service httpd restart

Please note that it is recommended to use ModSecurity packages provided by Plesk to avoid any malfunctioning. Install ModSecurity using Plesk autoinstaller, refer section 3 in KB #122577 .

Search Words

horde database removed

Horde no adjunta ficheros


Multipart parser detected a possible unmatched boundary

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