ZyXEL Communications ZyWALL 5 Support Notes page 223

1.2.1.1 Block MSN (Chat, File transfer)
Select Drop Packet in the Action field of all the MSN related signatures.
1.2.1.2 Block MSN (Chat only, no File transfer)
Select Drop Packet in the Action field of the MSN file transfer related signatures and keep
other signatures No Action.
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ZyWALL 5 Support Notes
223