Something goes wrong with one of our lab servers - when Pi System Explorer is started the message box "Root element is missing" appears. In the same time in Windows Event Viewer is generated the error -> Login failed for user ''. Reason: An attempt to login using SQL authentication failed. Server is configured for Windows authentication only. [CLIENT: <local machine>]
1) Note that the user is empty!
2) I have reinstal the Pi server and client part with new PIFD database but the problem stays.
3) The more cofusing part is that the Pi is accessible from Pi System Explorer on another machines. This error is appear only when Pi System Explorer is local!
4) SQL mixed mode is selected and thePIFD DB is accessible from SQL Managment Studio (both authentication types).
Do you have any ideas for eventual reasons causing that error?