Netcat (the 'nc' command in linux) is a more effective way than telnet of checking if a specific port is open on a destination system. In an Element Software context, it can be used to check connectiv...Netcat (the 'nc' command in linux) is a more effective way than telnet of checking if a specific port is open on a destination system. In an Element Software context, it can be used to check connectivity from the mNode to various cluster management IP's, from the mNode to the ActiveIQ endpoint (monitoring.solidfire.com), and between IP's on the storage network (the latter requires assistance from NetApp Support).