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completely block TeamViewer For FortiGate

Posted on 2016-09-25
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Last Modified: 2016-10-15
Hi.....
I need to completely block team access from outside to internal clients. I need to make sure in my network that no on uses team viewer in my network

i have Fortigate 300D
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Question by:Rami Mansour
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5 Comments
 
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Assisted Solution

by:arnold
arnold earned 100 total points (awarded by participants)
ID: 41815455
Identify their IP range, and block outgoing traffic to that destination.

Adding the destination with a log event....

A simpler option in an AD environment, setup a software restriction GPO blocking the running of teamviewr.exe.
Note it will not prevent a determined individual from adjusting the application name, runn.........
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LVL 69

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by:Qlemo
Qlemo earned 100 total points (awarded by participants)
ID: 41815516
Blocking all IPs is hard to do, there are a lot of TeamViewer servers ...
Blocking the EXE itself is more promising, though easy to circumvent.
Anything else requires to analyze the traffic - very difficult, in particular with SSL.
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LVL 27

Assisted Solution

by:Dr. Klahn
Dr. Klahn earned 100 total points (awarded by participants)
ID: 41815517
This page has a detailed explanation of one user's approach, which also short-circuits TeamViewer's fallback strategy of tunneling using port 80.

https://mediarealm.com.au/articles/2014/10/block-teamviewer-network/

However, as Qlemo points out above, if the application now tries to circumvent DNS blocking by using servers outside the teamviewer.com domain, it will probably be necessary to block the executable and hope none of your users are smart enough to rename it.
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Muhammad Mulla earned 200 total points (awarded by participants)
ID: 41816318
Under Application Control on your Fortigate, you will find 3 different signatures for TeamViewer in the Remote.Access category.

Block all of them under application overrides.
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Expert Comment

by:Dr. Klahn
ID: 41844848
EE email requested stale question closure.
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