I'd say, the default DATEFIRST in a session depends on the default language of the login.

I've seen issues like this related to VSS-Backups. During these backups the server is halted for a short-term including network cards. In one AG-Environments the primary went in pending state...

You try to install CU13 for SP2 on an SP1 Installation. This will not work. You must first install SP2 (Download at https://www.microsoft.com/en-us/download/details.aspx?id=56836). Afterwards you can apply the latest...

You must check permissions in AD, maybe objects have been moved to different OUs with different permissions attached to them. For this to work the CNO (Cluster Name Object =...

You can make up your own application name for the -m parameter and provide this in the connection options in SSMS. That way no one else can use up your...

The behavior you are describing is a successful drain operation. When the drain action is started for the cluster all resources are moved to a different node. This results in...

You can see the "When" in the SQL Errorlog. You can also check the SQL Default Trace. There you might find information on the username and hostname the command was...