When I try to open the MSSQL WebAdmin, I got the following error:
The page you are looking for cannot be displayed because an invalid method (HTTP verb) was used to attempt access.
HTTP Error 405 – The HTTP verb used to access this page is not allowed.
Internet Information Services (IIS)?
Try to fix it with
\Plesk\admin\bin>defpackagemng –fix –type=sqladminmssql