which port is racadm (remote) using to contact a server?

[Alois Treindl]

If racadm is used remotely to contact the RAC card in a Poweredge 
server, which port(s) is(are) used for communication?

I get:
racadm -r [IP-ADDRESS] getsysinfo
racadm getsysinfo:: transport failed

It may be a firewall problem, because the is a packetfilter between the 
local host and the remote Poweredge.
I need to configure the packet filter correctly to get the racadm 
traffic through.