So, what can we do? Well, there is a registry tweak that you can try. However, remember all the dire warnings about...
modifying the registry and all that -- have a backup, etc. -- then change the registry on the PDC emulator in the domain. (Find the PDC emulator by using the netdom query FSMO command) the registry key is: HKLM SystemCurrentControlSetControlLSA. Add a value called TCPIPClientSupport with a data type of REG_DWORD and give it a value of 1. Then restart the PDC emulator.
I am told this value is case sensitive. You can read more about this problem by looking at KB article 236111. I don't know if there will be a problem with this over Check Point VPN-1. Let me know if this solves your problem.
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