Symptoms
DB Webadmin goes to http://serverhostname:8401 instead of http://mssql.domainname:80 when trying to access it through Plesk, Domain, Databases, select database, DBWebAdminResolution
Please download the following file:http://download1.swsoft.com/Plesk/Autoupdate/Windows/8.2.0/124580/db_webadmin.php
and place one to %plesk_dir%\admin\htdocs\domains\databases folder.
Note: Please see how to install Plesk hotfixes properly.
Additional information
%plesk_dir% is environment variable which points to Plesk installation folder. By default it is C:\Program Files\SWsoft\Plesk
%plesk_bin% is environment variable which points to Plesk binaries folder. By default it is C:\Program Files\SWsoft\Plesk\admin\bin