IPSec on the Client TCP connections via USB

We have a problem (and I noticed that several other people here are as well) to our users of broadband remote is not not able to connect. We just recently started getting complaints from users at home XP they were getting errors while trying to connect to the hub.

To begin troubleshooting we moved our hub 3015 outside our firewall temporarily. Users were still unable to connect. After some additional troubleshooting, we were able to successfully reproduce this problem by simply changing the VPN client to users of IPsec over TCP to IPsec over UDP.

Then, we tried to identify why she passed to some customers, but not all. In the end, the only thing we could find really different was that customers who have a USB port to connect to the network instead of a correct Ethernet port cannot connect via IPSec over TCP. We have tested and verified on several operating systems, including Windows 2000, XP Home and XP PRO. We have also tested and verified with multiple VPN Clients including 3.5.1 and 3.6.3b.

The end result is that all case users who use a type USB connection cannot connect via IPSec over TCP. All users who connect through a correct Ethernet adapter are able to connect via another method.

Our problem is that we cannot run UDP connections behind our firewall without conversion on NAT. We send a client preconfigured to our users which forces to use tcp port udp by default 10000 10000 verses. We do this for several reasons, but the most important of them is our firewall will not redirect sessions IPSec UDP, IPSec TCP sessions only.

Leaving the VPN concentrator outside the firewall and exposed is not an option. So, I find myself with say to all my users USB that is the only way that they can connect to install an Ethernet card, which ultimately is not really much of an option considering expenditure and technical knowledge necessary to pull it off the coast with hundreds of individuals it just will not fly.

So, this brings me to this forum. Before I open a TAC case I hear experts to try to determine as closely as possible, if this is a problem of Microsoft or Cisco VPN client. I have my suspicions that this is owned by Microsoft, but I can't prove anything yet. Does anyone else have an idea on this? Please, I invite everyone to test this out and let us know what you find. If you would like more details on the methodology please let me know and I would be happy to provide it. I think it is potentially a huge problem only by the number of complaints I've seen in this forum. My supervisor thinks I smoking something when I try to explain this to him. All he can say is "if it was really a problem, more people would certainly also, and you would have heard about it now, it must be in your configuration." GO FIX"(does all this sound familiar?)

I appreciate all of the comments that everyone is willing to give. I think that if we as a community get together on this we can find a solution.

Thanks for your time!

It is a bug, use the bugtool kit to see bug CSCdv00229.

Tags: Cisco Security

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