What's the port of this connection?

I’m trying to make some reverse engenering capturing all data from one box that I have here. I’ve captured some packets and as I can see, the box connects to one server and make some communications using TCP. The ‘problem’ is that I tryied to connect to the same server from the same source IP, but I can’t…always get connection refused.

I’m trying to connect to server on port 20070 using telnet (or ‘raw’ mode in putty). What I’m doing wrong?
I know that could me something blocking my connection… but the box still connecting from the same network without any problem!