SSO (single sign on) is used to provide seamless browsing from one product panel to another without having to relogin everytime. In Plesk 9 SSO is mainly used to provide integration with Parallels Plesk Billing. If you are not using Plesk Billing then you can disable SSO.
[QUOTE]I also wonder if changing the “Full Hostname” on the “Settings” -> “Server Settings” page would help. Currently it is ip-000.000.000.000.ip.secureserver.net (with the actual IP has been changed to 0’s for this forum), but that doesn’t go to any address?[/QUOTE]
No quite sure, you can try to see if it does but if it does not you can set hostname that resolves correctly yourself in SSO preferences:
/usr/local/psa/bin/sso -g ==> to check current settings
/usr/local/psa/bin/sso -s ==> to change settings
/usr/local/psa/bin/sso –help for more info.