forefront vpn connection, single ping only

Microsoft forefront running on server 2008r2

vpn clients configured to use internal dhcp server, which is working

the vpn dial-up connection gets a valid internal address

then, it can ping an internal server exactly one time and then all subsequent pings time out

thanks for any help you can give me on this problem
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gateguardAuthor Commented:
I discovered the problem:

The DHCP server failed and I had to rebuild it and it was giving out addresses that were already in use by VMs on the internal network.  I guess it pinged one time, detected the duplicate address and then took that address offline at the Forefront server.

Anyway, once I changed the scope of the DHCP addresses, the problem was resolved.

I would like to keep this question in the database for future lookup so anyone who adds anything relevant about DHCP and duplicate addresses gets the points.  Because I don't want to delete this question.

I read the title and it sounded like something out of "Hunt for Red October". ;-)

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gateguardAuthor Commented:
Points for an answer that isn't really an answer? ;-) Thanks!
gateguardAuthor Commented:
you are welcome
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