Symptoms
Cannot change a password for MSSQL via Plesk > Tools & Settings > Database Servers > .MSSQLSERVER20** > Settings > Authentication due to the following error:
PLESK_ERROR: The test connection to the database server has failed because of an unacceptable password
Cause
Strict password requirements/policies.
Resolution
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Connect to the server via RDP
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Open Command Prompt as Administrator and execute the following command to open SQL Server Management Studio:
C:> ssms.exe
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Go to SQL Server Management Studio > Security > Logins > Administrator > Properties
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Disable Enforce password policy and Enforce password expiration
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Change a password for MSSQL via Plesk > Tools & Settings > Database Servers > .MSSQLSERVER20** > Settings > Authentication again
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If the issue still persists, set Minimum password length on a Windows level to 10:
This requirement should be met by the password for MSSQL server.
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