Plesk Mssql Delete database user failed: Timeout expired

When you try to delete a domain from Plesk or delete straight the mssql database user from a plesk’s client, you may encounter the abover error:

Delete database user failed: Timeout expired

the workarround for this is :

1.login to Plesk’s (psa) database using an mysql client like MySQL Query Browser

2.SELECT * FROM data_bases where name=’put_here_the_name_of_the_database’ AND type=’mssql’;

3. find the domain id, just go to the client of the domain, and in the domain select list,
put your mouse over the domain name, in the status bar of the browser you will see something like:
https://yourserver.tld:8443/domains/dom_ctrl.php3?dom_id=123&previous_page=domains
the domain id there is “dom_id=123″.

4.Run DELETE FROM db_users where id=’123′;

then you can proceed from Plesk to delete the domain and database.