hey guys, howz everybdy:)
i was jus thinkin...my friend's company only allow yahoo mesgger to be used on their machines....i noe instant messengers , are sometimes blocked by the admins...so no trojans cannot back connect throu the open ports opened by the messnegers?...(novice so may not be the right chooice of wrds;)
so how come they allow...yahoo...but not msn...any ideas?
Nope its not got anyting to do with back connecting through a messengers ports.. its so that
1. employees dont waste time chatting
2. people cant send them malicious files.. viruses, worms, trojans etc.
So the admins usually block some of the instant messaging clients.. in this case they have not blocked Yahoo messenger. Sometimes blocking messaging clients can be difficult if the port range is large / arbitrary, or the firewall is not application-aware.. or the service keeps adding new servers.