==== Required information ====
- iRedMail version (check /etc/iredmail-release):
- Linux/BSD distribution name and version: 12.04
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): LDAP
- Web server (Apache or Nginx):Apache
- Manage mail accounts with iRedAdmin-Pro? Yes
- Related log if you're reporting an issue:
====
When I log in Roundcube (version 1.1.1).
Open ""Setting>Plugins Download> select Download stable versions of plugins for Roundcube 1.1.1>
appear  The remote server did not respond to a connection attempt.

Error log:
mail roundcube: <tpiqpp75> PHP Error: No handler found for action plugin.idle_timeout_alive in /usr/share/apache2/roundcubemail-1.0.1/program/lib/Roundcube/rcube_plugin_api.php on line 463 (POST /mail/?_task=settings&_fr$ $gs&_framed=1&_action=plugin.idle_timeout_alive?_task=&_action=)

how to prevent this error?

Arnis