I got a call today from a colleague that had an issue with an ESX Server that was behind a firewall that kept on disconnecting every 30 seconds, and he could not understand why.

I remember that I had encountered this before, and the solution this was happening because not all ports in the firewall were open to allow the traffic through, and there the Host was losing connection.

So as a reference for myself (and anyone else that can use it) here is what needs to be opened.

Happy holidays to you all!