Error :  When try to access the Horde from cPanel  then it shows following error.

Warning: fopen(/var/cpanel/horde/log/horde_0.log) [function.fopen]: failed to open stream: Permission denied in /usr/local/cpanel/3rdparty/lib/php/Log/file.php on line 216
A fatal error has occurred

DB Error: connect failed

Details have been logged for the administrator.

Solution:

The problem due to the ” Horde Groupware Webmail Edition detected ” means when you have try to update the Horde by using following commands

root@server[~]# /usr/local/cpanel/bin/update-horde --force

Then it shows the following error

!!!     Horde Groupware Webmail Edition detected        !!!
Install or update of standard Horde Webmail is disabled.
Horde Groupware Webmail was installed with cPanel 11.25.1.
Downgrades of Horde are not permitted due to MySQL differences.

Then you need to move the file

root@server[~]# mv /var/cpanel/horde/groupware_version /var/cpanel/horde/groupware_version-bak

After that run following commands

root@server[~]# /usr/local/cpanel/bin/update-horde --force

Done

Now horde is updated and reset and you can able to access it without any problem.