Webmail shows 504 Gateway Time-out

Symptoms

• Unable to log in to webmail service or performing some operations once the user is already logged in to webmail service, the following error is shown:

  504 Gateway Time-out

• When importing a mailbox via webmail service, the following error is shown in the browser console:

  Failed to load resource: the server responded with a status of 504 ()

• In Nginx log file /var/log/nginx/error.log one of the following error messages might be shown:

  [error] 12026#0: *1721 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 203.0.113.2, server: webmail.example.com, request: "POST /services/ajax.php/imp/viewPort HTTP/1.1", upstream: "http://203.0.113.1:7080/services/ajax.php/imp/viewPort", host: "webmail.example.com", referrer: "http://webmail.example.com/imp/dynamic.php?page=mailbox"

  ---

  [error] 13148#0: *515049 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 203.0.113.2, server: webmail.example.com, request: "POST /services/ajax.php/imp/importMailbox?jsonhtml=1&token=... HTTP/2.0", upstream: "https://203.0.113.1:7081/services/ajax.php/imp/importMailbox?jsonhtml=1&token=...", host: "webmail.example.com", referrer: "https://webmail.example.com/imp/dynamic.php?page=mailbox"

Cause

Insufficient timeout values are configured.

Resolution

1. Connect to the server via SSH

2. Edit the Webmail PHP.ini file and increase max_execution_time and max_input_time values:

   For Horde: /etc/psa-webmail/horde/horde/php.ini

   # egrep “max_execution_time|max_input_time” /etc/psa-webmail/horde/horde/php.ini
   max_input_time = 600
   max_execution_time = 300

   For RoundCube: /etc/psa-webmail/roundcube/php.ini

   # egrep “max_execution_time|max_input_time” /etc/psa-webmail/roundcube/php.ini
   max_input_time = 600
   max_execution_time = 300

   For Plesk Premium Mail: /opt/psa/var/modules/kolab/webmail/php.ini

   # egrep “max_execution_time|max_input_time” /opt/psa/var/modules/kolab/webmail/php.ini
   max_input_time = 600
   max_execution_time = 300

3. Edit the Apache configuration and increase FcgidIOTimeout value:

   For CentOS / RedHat OS: /etc/httpd/conf.d/fcgid.conf

   # grep FcgidIOTimeout /etc/httpd/conf.d/fcgid.conf
   FcgidIOTimeout 300

   For Ubuntu/Debian OS: /etc/apache2/mods-enabled/fcgid.conf

   # grep FcgidIOTimeout /etc/apache2/mods-enabled/fcgid.conf
   FcgidIOTimeout 300

4. Edit the Nginx configuration file /etc/nginx/nginx.conf adding the following directives inside the http {} code section:

   proxy_send_timeout 300s;
    proxy_read_timeout 300s;
    fastcgi_send_timeout 300s;
    fastcgi_read_timeout 300s;

5. Reload Apache service:

   For CentOS / RedHat OS:

   # service httpd reload

   For Ubuntu/Debian OS:

   # service apache2 reload

6. Reload Nginx service:

   # service nginx reload