Generally, you would need to add a filter on your router (access-list) so it does not allow TCP connections to the messenger service by blocking the TCP port listed and also port 80. Keep in mind that MSN may change the Ip address from time to time and this will require you to add/change the access-list so your internal users are unable to access the updated servers.
If you had a proxy server this will be the preferred way of blocking this type of service.
BenefitsDocumentationPrerequisiteImage Download LinksLimitationsSupported PlatformsLicense RequirementsTopologyStep-By-Step ConfigurationConfigure Virtual ServiceActivate the virtual service and configure guest IPsConfiguring UTD (Service Plane)Configurin...
Login to the FXOS chassis manager.
Direct your browser to https://hostname/, and log-in using the user-name and password.
Go to Help > About and check the current version:
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...