- Plesk Onyx for Linux
When trying to log into Webmail the following error is returned
CONFIG_TEXT: This page isn’t working
webmail.example.com is currently unable to handle this request.
HTTP ERROR 500
The following is registered in
CONFIG_TEXT: PHP Fatal error: Call to undefined function mb_strtolower() in /usr/share/psa-roundcube/program/include/rcmail.php on line 584
- Issue persists for both Roundcube and Horde webmail.
mb_strtolower extension for OS PHP handler that is defined by
mbstring PHP module.
- Log into Plesk.
- Go to Tools & Settings > PHP Settings > PHP FastCGI by OS Vendor.