Transmission

I own a Macbookpro 17" 2.6 gb, and have one airport extreme and two aiport express.
Do not understand why the port is close. already check the settings in the airport utility, and continue close.
The next is the info in the log of my transmission

2009-07-07 22:44:31 -0600 upnp.c:97 [Debug] Port ...