TCP port 551 is the Corente service port and is used to terminate authenticated connections between trusted Corente Cloud Services Exchange elements: Corente Services Gateways, Corente Cloud Services Exchange IPSec Clients, and the Corente Services Control Point (SCP).

When placed behind an existing firewall, customers must define firewall rules that redirect port 551 traffic to the gateway. Corente Cloud Services Exchange offers two options to accomplish this. One option is designed to deal with the dynamic nature of IP addressing in today’s Internet world. The second option is the more traditional approach where every endpoint has a static, non-changing IP address.