Resolution
SSO mode can be managed via command line utilities only.The utilities are /usr/local/psa/bin/sso for Parallels Plesk Panel and /usr/local/sitebuilder/utils/sso_config for Parallels Plesk Sitebuilder. They are /opt/psa/bin/sso and /opt/sitebuilder/utils/sso_config for Debian and Ubuntu.
To register SSO server in Parallels Plesk Panel:
~# /usr/local/psa/bin/sso --set-prefs -server https://your.sso.server.com:11443/
SUCCESS: SSO preferences are successfully updated
~#
Where your.sso.server.com is full hostname of server where SSO application is running.
To get SSO preferences:
~# /usr/local/psa/bin/sso --get-prefs
SSO on
sso server url: https://your.sso.server.com:11443
~#
To enable SSO mode:
~# /usr/local/psa/bin/sso --enable
And disable SSO mode in Parallels Plesk Panel:
~# /usr/local/psa/bin/sso --disable
Plesk utility sso has help page. Run the utility with --help to get list of all available options.
To register SSO server in Parallels Plesk Sitebuilder:
~# /usr/local/sitebuilder/utils/sso_config register https://your.sso.server.com:11443/
To get status of SSO mode:
~# /usr/local/sitebuilder/utils/sso_config status
Disable SSO mode in Parallels Plesk sitebuilder:
~# /usr/local/sitebuilder/utils/sso_config unregister
Sitebuilder utility sso_config is an internal one that does not have help page. Use Parallels Plesk Panel to manage SSO mode in Parallels Plesk Sitebuilder.