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port 1720 always open

Hi,

I have two layer of firewall , front end is checkpoint and back end is cisco fwsm , when i do nmap port sacn from external network to inside any host I can see port 1720 is as always open , but there is no service running in server with port 1720, I know port 1720 is H.323 call setup protocol used by multimedia collaborative apps such as NetMeeting to establish and control a collaborative session.

could anyone help me on this ?

Regards,

Musthafa.

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