Horde (webmail) refreshes the login page when entering the correct password

Symptoms

• Unable to login into Horde and Horde reloads the login page when entering the correct password

• In /var/log/maillog:

  CONFIG_TEXT: Dovecot
  ns22 dovecot: imap-login: Login: user=<joedoe@example.com>, method=CRAM-MD5, rip=::1, lip=::1, mpid=5403, TLS, session=<L7bg/PShIs0AAAAAAAAAAAAAAAAAAAAB>
  ns22 dovecot: service=imap, user=joedoe@example.com, ip=[::1]. Logged out rcvd=26, sent=512
  Courier
  ns22 courier-imaps: LOGIN, user=joedoe@example.com, ip=[::1], port=[52772], protocol=IMAP
  ns22 courier-imaps: LOGOUT, user=joedoe@example.com, ip=[::1], headers=0, body=0, rcvd=46, sent=350, time=0, starttls=1

• With Horde debugging enabled the following notice appear in log file /var/log/psa-horde/psa-horde.log

  CONFIG_TEXT: HORDE Guest user is not authorized for Horde

• stracing the Apache process provides the following line:

  CONFIG_TEXT: open("/var/lib/php/session/sess_l2mscgvjj03gefioseknson8b6", O_RDWR|O_CREAT|O_NOFOLLOW, 0600) = -1 EACCES (Permission denied) <0.000069>

• SELinux is enabled

  # getenforce
  Enforcing

Cause

The directory /var/lib/php/session/ has incorrect SELinux context.

Resolution

Restore the SELinux context:

1. Connect to the server via SSH

2. Restore the SELinux context:

   # restorecon -R -v /var/lib/php/session/

3. In case the issue remains, reinstall "psa-selinux" package to reapply Plesk SELinux policies:

   # yum reinstall psa-selinux