Symptoms
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Plesk Premium Email interface, its emails and other menus load slowly and may fail with 504 error message.
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Following error messages can be found in
/var/log/roundcubemail/errors.logfile:PHP Error: Curl error: Connection timed out after 10000 milliseconds in /usr/share/pear/HTTP/Request2/Adapter/Curl.php on line 149 (GET /n9HYdwfLMCi5oBXo/?_task=mail)
PHP Error: Curl error: Connection timed out after 10001 milliseconds in /usr/share/pear/HTTP/Request2/Adapter/Curl.php on line 149 (GET /n9HYdwfLMCi5oBXo/?_task=mail&_mbox=INBOX&_action=compose)
Cause
Firewall does not permit recursive connections to the global IP address.
Resolution
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Connect to the Plesk server via SSH
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Add the following row to
/etc/hostsfile using any text editors like vi-editor:127.0.0.1 webmail.example.com
Alternative solution
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Connect to the server via SSH
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Configure
/etc/roundcubemail/kolab_files.inc.phpfile in the following way:$config['kolab_files_url']='https://webmail.example.com/chwala';
Additional information regarding this configuration can be found in Kolab documentation.