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All Forums >> [Threat Management Gateway (TMG) 2010] >> General >> VPN CLIENTS SPOOFING ERROR Page: [1]
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VPN CLIENTS SPOOFING ERROR - 16.Sep.2010 6:29:27 AM   


Posts: 1
Joined: 16.Sep.2010
Status: offline
We have TMG server which occasionally prevent already connected VPN clients to access internal network with many spoofing error where destination IP is PPP adater RAS interface? In most cases we have no problem, I also noticed that we have problems with DNS packets from VPN clients to internal DNS what cause error:

Denied Connection
Log type: Firewall service
Status: A packet was dropped because Forefront TMG determined that the source IP address is spoofed.
Rule: None - see Result Code
Source: VPN Clients (
Destination: Local Host (
Protocol: Unidentified IP Traffic (UDP:41840)

Please Help
Post #: 1
RE: VPN CLIENTS SPOOFING ERROR - 21.Sep.2010 3:02:46 PM   


Posts: 50013
Joined: 10.Jan.2001
From: Texas
Status: offline
It's a bogus error. Nothing to worry about. Been around since ISA 2004.



Thomas W Shinder, M.D.

(in reply to dejan.tanasijevic)
Post #: 2
RE: VPN CLIENTS SPOOFING ERROR - 21.Sep.2010 5:57:13 PM   
Jason Jones


Posts: 4663
Joined: 30.Jul.2002
From: United Kingdom
Status: offline




Jason Jones | Forefront MVP | Silversands Ltd
My Blogs: http://blog.msedge.org.uk/ and http://blog.msfirewall.org.uk/

(in reply to tshinder)
Post #: 3

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