Connect to a File Server with a Specific Username (macOS)   To connect to an SMB file server using a different username, you can use this procedure: In the Finder, choose the  Go  menu, then select  Connect to Server .   Type the network address for the computer or server in the  Server Address  field in the following format: smb://username:*@server.name The  ” * ”  is to trigger the server login window for your SMB server, so that the password for the  username  account can be entered. Click the  Connect  button. Enter the desired username and password when prompted: Username:   username Password:   The current account password for username    Select the share on your SMB server that you want to use.   WARNING:  Do not try to mount the same share twice using different usernames. One way you can verify that you’re actually connected using different usernames is to use the  mount  command in  Terminal. This should show all mounted volumes on the Mac, including mounted fileshares. The fileshare mount information should include which account was used to mount the share.