If you face this error: Access is denied. (Error code 5) at Unable to connect to pipe \\.\pipe\psapipe , the solution is very easy
ERROR: PleskFatalException
Unable to remove hosting: SiteAppManager: Provided Client object is invalid.
Solution: you have to login to psa’s database via MysqlQuery Browser or any other client you want and then the following steps
In plesk (8.x) this error appear when I try to press on “Backup” button on a particular domain.”Unable get daemon current status: Unable to create UNIX socket /usr/local/psa/tmp/agent-runner.38023: Connection refused”