An attempt to log in to Plesk Panel fails with the following error:
An internal error occurred in the Single Sign-on authorization engine
/usr/local/psa/admin/panel.log the following error appears:
2014-04-10T21:46:19+00:00 ERR (3) [sso]: Unable to find Single Sign-On Authorization statement. StatusMessage: Exception: Can not parse property line: '<!DOCTYPE html>'
The root cause is corrupted
If billing is not used on the Plesk installation, disable
sso service to fix the issue:
root@plesk:~# /opt/psa/bin/sso -d 2014-11-04T16:11:34+02:00 INFO (6) [sso]: Save current SSO configuration SUCCESS: SSO disabled
Otherwise, contact Odin Technical Support regarding the issue.