The Check Server Name matcher creates a match based on the name of the Dynamic Data Masking Server that receives the request.
You can create connection rules and security rules for multiple Dynamic Data Masking Servers in a single Management Console. Use the Check Server Name matcher to apply the connection rule action to the request if the request is to the Dynamic Data Masking Server that you specify in the Server Name parameter.
The Check Server Name matcher uses the following parameter:
Server Name
The name of the Dynamic Data Masking Server that receives the request.