Article ID: 121981, created on Jun 11, 2014, last review on Jun 16, 2016

  • Applies to:
  • Plesk 12.5 for Windows
  • Plesk 12.0 for Windows
  • Plesk 11.5 for Windows


  1. Login to MailEnable webmail just return login page without any error.

  2. Login to Horde webmail returns 500 Internal Server Error

  3. The following entries can be found in Event Viewer:

    ModSecurity: collection_retrieve_ex: Unable to retrieve collection (name "global", key "global"). Use SecDataDir to define data directory first.


    ModSecurity: Rule 123qwe [id "981242"][file "C:\/Program Files/ModSecurity IIS/owasp_crs/base_rules/modsecurity_crs_41_sql_injection_attacks.conf"][line "237"] - Execution error - PCRE limits exceeded (-8): (null). 


ModSecurity rules prevent MailEnable/Horde webmail work.


Remove Modsecurity modules for MailEnable and Horde webmails:

  • under IIS > MailEnable WEbMail site > Modules for MailEnable
  • under IIS > webmail(horde) site > Modules for Horde

Search Words


Server Error in Application "MAILENABLE WEBMAIL

Webmail not working

mailenable webmail

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