- Plesk 12.5 for Windows
Unable to remove/add data in the specific database in Plesk > Domains > example.com > Databases due to the following error;
Remove database failed: mssqlmng failed: Changes to the state or options of database 'database' cannot be made at this time. The database is in single-user mode, and a user is currently connected to it.
Database is using the single-user mode.
Switch database to multiple user mode using SQL Management Studio:
ALTER DATABASE "database_name" SET MULTI_USER
Additional information can be found in Microsoft Technet Library .