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You mainly see this error in Plesk 9.x if you are trying to access it using Google Chrome. The reason you see this is becuse of the way it handles Plesks SSO or “single sign on”.
SSO is mainly used to provide intergration with Parrallels Plesk Billing by providing you with a single login between products without having relogin everytime you switch between products.
There are two fixes for this. Either you upgrade to the latest Plesk build, Plesk 10.x or you disable SSO. The easyest is to disable it.
To disable login to your Plesk server via SSH and run the command:
To renable SSO run: