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[ScreenOS] How to block the 'LogMeIn' application

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Article ID: KB23450 KB Last Updated: 08 Oct 2012Version: 2.0
Summary:
This article provides information on how to block the LogMeIn application.
Symptoms:
  • LogMeIn (www.logmein.com) is an application that requires a user behind a firewall to connect to a central server.

  • By using login credentials, which are provided by the LogMeIn website, a user can access a PC and control it from the Internet.

  • This type of configuration does not use any forwarded ports from the firewall.

  • Rather, it uses standard SSL (HTTPS) to encrypt the communication between the client, server, and remote PC.

  • If HTTPS is blocked, it can then make a connection via HTTP as well. Even the initial keep alives can work on both HTTP and HTTPS.
Cause:
As the LogMeIn server has several IPs and even if one IP is blocked, it automatically switches to another. If the range of IPs is blocked, it is possible that genuine websites, which fall in the subnet, may be affected.

Solution:
The LogMeIn application cannot be blocked from using Juniper firewalls.
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