I am a consultant working with a company that uses Nortel Contivity client. I am having many problems using this VPN client.
My normal setup which has worked with several VPN clients including Nortel, is 8 PCs including 1 SBS and 1 W2k3 server are all attached to a switch. On the SBS, I have dual NICs, one for internal and one for external in between them is the Basic firewall and NAT. Usually I also have an Edimax dual WAN router on the external NIC with Cable on one WAN and DSL on the other. This configuration has served me well, the bandwidth aggregation is great and if one or the other of my ISPs went down over the last 3 years, I never noticed.
Anyhow I am never able to connect with the Nortel client to this particular VPN site. I always get "Remote Host not Responding". By the way this is a client PC on the network, not the server I am trying to connect with. If I connect the DSL directly to this client PC, the VPN works (not a good situation though). If I connect the client PC to the router and ofcourse the WANs are connected as normal. The VPN works this way also.
However the combination does not work (double NAT'ing???). The final configuration I tried is the SBS external NIC to the DSL and the internal setup the regular way. This does not work. Everyone on the network has internet, my Cisco and MS VPNs work, but not this Nortel. So I think I have narrowed it down to the SBS, and I need to know what it would take to get this working properly.
I was told by their tech support that UDP port 500 should be allowed as well as Protocol 50 and 51. I do not know how to enable protocols 50, 51 or otherwise, but I switch off the firewall and it still does not work. The final recommendation is to set up a static NAT, somehing else I am not familiar with.
So, if there is any ideas on either how to follow ther requests or any other clues as to what the problem is, I would very much appreciate it.