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Blocking NetGuarder / AD Sender Messenger

By silentsound ·
Anyone know what ports NetGuarder's AD Sender product uses to bypass firewalls?

Messenger spam from NetGuarder's AD Sender keeps getting through my ACL's on my Cisco router, even though I'm blocking TCP/UDP 135, 137, 138, 139, and 445. I noticed NetGuarder advertises a way of getting through firewalls, but they obviously don't provide additional information.

Thanks!

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