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IPSec Tunnel Tru. ISA or Microsoft Forefront Threat Management Gateway

Posted on 2009-05-19
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Last Modified: 2013-12-04
I have ISA2006 server installed on my office network and all the pc on the network are  using SNAT. some of the users on the network  have nortel vpn client to connect to corporate head office. Through ISA2006/TMG SNAT nortel vpn client fails to establish a tunnel.
The policy for ISA is set to allow all traffice from inside(internal network) to external and no other restriction is added in the policy.
nortel client version is v04_87
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Question by:Manojc3
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pwindell earned 1500 total points
ID: 24487066
It is failing due to NAT-T  (NAT Traversal)

IPSec is not capable of running over NAT.  If the Nortel Client was using PPTP it would be working fine.  To overcome the IPSec's failure of NAT requires NAT Traversal.  

Make sure the Nortel Client is configured to use NAT-T

These links may help:
http://www.isaserver.org/articles/IPSec_Passthrough.html
http://forums.isaserver.org/m_2002012471/tm.htm
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Author Comment

by:Manojc3
ID: 24603930
Yes I downloaded the new notel vpn client 6.0 which has NATT support. It working now. Thank you.
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LVL 29

Expert Comment

by:pwindell
ID: 24604025
Very good.  Glad it worked out for you.
 
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