Unable to suspend subscription or open Databases: Wrong parameters for PleskUserDBException

Symptoms

• When trying to suspend a subscription the following error appears:

  PLESK_ERROR: ERROR: 500
  Error: Wrong parameters for PleskUserDBException([string $message [, long $code [, Throwable $previous = NULL]]]) (PleskException.php:629)<br />
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• The same error appears when navigating in Subscriptions > example.com > Databases or in Tools & Settings > Databases > click on MSSQL

• When debug is enabled the following error can be found in %plesk_dir%admin\logs\php_error.log:

  CONFIG_TEXT: [2020-04-20 15:15:54] ERR [panel] Wrong parameters for PleskUserDBException([string $message [, long $code [, Throwable $previous = NULL]]]):
  0: D:\Program Files (x86)\Parallels\Plesk\admin\plib\PleskException.php:629
  Exception->__construct(string 'Failed to connect to the database server: SQLSTATE[IMSSP]: An unescaped right brace (}) was found in...', string 'IMSSP')

• If remote database server's sa user has the "}" symbol in password, it is impossible to add such server at Tools & Settings > Database Servers:
  

  PLESK_ERROR: Error: Connection to the database server has failed because of network problems: Try to establish connection failed

Cause

This is caused by a bug with ID PPPM-11872 which is planned to be fixed in future Plesk updates.

Resolution

Until it is fixed use below workaround:

1. Login to the server via RDP.
2. Download DatabaseManagerMSSQL.php and place it to %plesk_dir%admin\plib folder