Cause :

Error: Cannot open user default database. Login failed. Login failed for user 'xxxxxxxxxxxxx'.
Source: .Net SqlClient Data Provider

Solution :

Open Plesk > Click Websites & Domains > Click Databases > Click Database Name > Click Database Username and change follow things:

Change database user name xxxxxxxxxxxx to xxxxxxxxxxxx1
Old password xxxxxxxxxxx
New password xxxxxxxxxxx
Confirm password xxxxxxxxxxx

That's it.

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