Protocol Summary

MSN is an instant messenger software from Mircosoft.

Communication

MSN use TCP port 1863 as default login port. If 1863 is invalid, it will try to use port 80. MSN can also connect via a proxy server.

How to block MSN?

Because MSN can switch port automatically, so you can not block them only by disable the ports in the firewall. We recommend you to block MSN in two ways:

• 1). Block all MSN server IP address.
• 2). Use firewall which has deep content inspection capabilities. Use firewall which has deep content inspection capabilities to block MSN.

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