Unable to log in to Plesk: An internal error occurred in the Single Sign-on authorization engine

Created:

2016-11-16 12:47:01 UTC

Modified:

2017-04-24 12:11:53 UTC

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Unable to log in to Plesk: An internal error occurred in the Single Sign-on authorization engine

Applicable to:

  • Plesk 11.5 for Windows
  • Plesk 11.5 for Linux
  • Plesk 12.5 for Windows

Symptoms

Unable to login to Plesk:

An internal error occurred in the Single Sign-on authorization engine

In /var/log/plesk/panel.log on Linux or %plesk_dir%\\logs\\php_error.log the following error appears:

ERR (3)  [sso]: Unable to find Single Sign-On Authorization statement. StatusMessage: Exception: Can not parse property line: '<!DOCTYPE html>'

Cause

Corrupted sw-sso package

Resolution

If billing is not used on the Plesk installation, disable sso service to fix the issue:

for Linux:

# /opt/psa/bin/sso -d
INFO (6) [sso]: Save current SSO configuration
SUCCESS: SSO disabled

for Windows:

"%plesk_bin%"\\sso.exe -d
INFO (6) [sso]: Save current SSO configuration
SUCCESS: SSO disabled

Otherwise, contact Plesk Technical Support regarding the issue.

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