Why am I unable to log in to my Horde Webmail?

For the Horde Webmail login process to work correctly, the configuration option "session.auto_start" must be disabled.

To Disable session.auto_start

1. Open the file "/etc/php.ini".
2. Modify the file contents to include the following entry:
   
   session.auto_start = 0
3. Save file, and then restart Apache.