Due to such security risk with telnet enabled on VTY. Is there an SSH option and to disable Telnet on current VG224 and newer models? We are in the works of replacing VG224's with a mix of VG350/320/310's for EOL reasons but also need to get Telnet disabled.
If you have enabled SSH on your VG224, you should be able to add the command "transport input ssh" to the vty ports. That will allow SSH and not allow other protocols (like telnet). Have you tried that? Or you did and it didn't take?