FortiGate
FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.
Jonathan_Body_FTNT
Article Id 190003
Description
This article describes how to block MSN for certain users and allow others.

Scope
FortiOS 4.0 and above

Solution
1) To block all MSN users except  those you want to allow, connect to the CLI and run the following commands:

# config im policy
(policy) # set msn deny
# end


This will deny everyone who is not on the list created via the GUI in step 2

2) Connect to the GUI and go to User > Local > IM > Create New > Create  ; create user with action allow.

Then you can add users with their MSN id to the list of allowed users.


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