[FW-1] Blocking Messenger Applications

[Juan Andres Galavis <jgalavis@FW1-NOSPAMATENTOVENEZUELA.COM.VE>]

Hi,

  You all might have heard this one before, but as I am new at this topic I
  will go through it again.
  What techniques have been used to block or drop at the firewall,
  Messenger generated traffic???? Which rules are the best to apply???

  Thanks a lot.....

  Saludos, Regards,

  Juan Andrés Galavís

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