Article ID: 115600, created on Feb 26, 2013, last review on May 11, 2014

  • Applies to:
  • Plesk for Windows


Logging in to Horde webmail produces the "500 Internal Server Error" after a minute. Only specific mailboxes are affected by the problem.


This problem may be caused by the existence of a large amount of messages in the mailbox (30,000 or more), which causes the PHP process to reach the timeout limit before all messages are listed during the login process.


Open Internet Information Services (IIS) Manager > <ServerName> > FastCGI Settings, select %plesk_dir%\Plesk\Additional\PleskPHP5\php-cgi.exe, click on Edit..., and increase Activity Timeout to up to 300 seconds. Restart the webmail(horde) site.

This will allow a successful login to the Horde Webmail interface. To avoid the problem, it is recommended to delete old messages or move them to the IMAP subfolder.

85a92ca67f2200d36506862eaa6ed6b8 56797cefb1efc9130f7c48a7d1db0f0c a914db3fdc7a53ddcfd1b2db8f5a1b9c

Email subscription for changes to this article
Save as PDF