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luisr · 09-24-2003, 10:12 AM

I have been reading here and there about NAT security and that it rejects connection attempts from outside that are not part of a conversation initiated from inside.

Now my question is, how do instant messaging services such as ICQ and MSN Messenger get through? I mean, when a user in your contact list sends you a message first. Or is that very initial message sent through a server that already had a connection with my computer and already got past the NAT router? Or is it that these services use standard ports that are allowed access by the router?

09-24-2003, 10:12 AM	#11
luisr Member (9 bit) Join Date: May 1999 Location: Juana Diaz, PR Posts: 378	I have been reading here and there about NAT security and that it rejects connection attempts from outside that are not part of a conversation initiated from inside. Now my question is, how do instant messaging services such as ICQ and MSN Messenger get through? I mean, when a user in your contact list sends you a message first. Or is that very initial message sent through a server that already had a connection with my computer and already got past the NAT router? Or is it that these services use standard ports that are allowed access by the router? __________________ Thanks. Luis...