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How do I Block WebEX?

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How do I Block WebEX? - 13.Nov.2002 2:41:00 AM   
PaulCyr

 

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Joined: 17.Mar.2001
From: Charlottetown, PE, Canada
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I don't want my users allowing external people taking remote control of their desktops. How do I block this application at our ISA Server?
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RE: How do I Block WebEX? - 13.Nov.2002 10:29:00 PM   
purcelm1

 

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Joined: 5.Nov.2002
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I just ran across this in Windows XP's personal firewall, according to that it uses TCP port 3389, so maybe make a protocol definition for that and then apply a deny filter to it. It's worth a shot.

Hope it helps!
Mike

(in reply to PaulCyr)
Post #: 2
RE: How do I Block WebEX? - 14.Nov.2002 3:34:00 AM   
PaulCyr

 

Posts: 60
Joined: 17.Mar.2001
From: Charlottetown, PE, Canada
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The following link describes how the application connects and as you can see this information is directly from the vendors web site.

http://www.webex.com/home/tech_security.html

As one enters a WebEx meeting, the WebEx client communicates with the conferencing server to establish a reliable and secure connection. In the process of establishing the connection, the WebEx client first attempts to connect using TCP (port 1270). If this port is blocked by a firewall, the WebEx client will then tunnel WebEx communications using HTTP (port 80). (If a customer elects to purchase and use SSL the traffic is carried over port 443.) By establishing communication between the thin client and the WebEx servers in this manner, customers' firewalls do not have to be reconfigured to enable online meetings, thus complying with corporate security policies that guard against the opening of firewall ports.

So, I think that port 3389 may be the wrong port to block, but thanks for the suggestion.

(in reply to PaulCyr)
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RE: How do I Block WebEX? - 14.Nov.2002 4:10:00 AM   
Netman

 

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Joined: 25.Oct.2001
From: Canada
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If you can utilize Group Policy on your network you can configure this:

User Configuration>Administrative Templates>System>Don't run specified Windows Applications

The client must run an agent of some type - so enabling the above policy and adding the application to the list should do the trick.

Hope this helps.

(in reply to PaulCyr)
Post #: 4
RE: How do I Block WebEX? - 14.Nov.2002 4:18:00 AM   
PaulCyr

 

Posts: 60
Joined: 17.Mar.2001
From: Charlottetown, PE, Canada
Status: offline
Excellent, that will work! I'll try it tomorrow.

Thanks.

(in reply to PaulCyr)
Post #: 5

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