This error message shows when attempting to log in to Horde webmail in Plesk servers. The problem is a result of invalid permissions/ownership of the webmail credentials file. The solution is pretty simple, permissions of /etc/psa/.webmail.shadow need to be set in a very specific way:
Plesk 8.6.*:
# chmod 640 /etc/psa/.webmail.shadow
# chown root:apache /etc/psa/.webmail.shadow
Plesk 9.5.*:
# chmod 640 /etc/psa-webmail/horde/.horde.shadow
# chown root:apache /etc/psa-webmail/horde/.horde.shadow/code>
Webmail access should be restored once the changes have been made.
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