Symptoms

1. After switching hosting type from Website hosting to forwarding and back to Website hosting, the following error displays:

    Unable to find service node for ip address with id=
   

2. According to /usr/local/psa/admin/logs/panel.log the Plesk tries to execute the query with empty value of one of its arguments:

   SELECT `s`.* FROM `ServiceNodes` AS `s`
   INNER JOIN `IP_Addresses` AS `ip` ON ip.serviceNodeId = s.id WHERE (ip.id = '') LIMIT 1
   

Cause

The behavior is caused by software issue #PPA-1672. The fix is included in Plesk Automation MU#7.

Resolution

Install latest PA updates according to the article.