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SBS2011 turn on Routing Remote Access DHCP quits responding, turn Routing Remote Access off DHCP works fine.

Server running fine for years, not sure what happened all of a sudden started when users lost VPN access and the LAN went offline. Turns out the DHCP server was unresponsive when I logged into the computer. Only way to get the LAN (email, websites, data, etc) to come up is disable or stop Routing and Remote Access. Soon as I do DHCP comes back online. I cannot get the two to work together. I ran "Fix my Network" and "Connect to the Internet" wizards without any luck.
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R. Andrew Koffron
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I'd remove the R&RA, reboot, and run the wizards again. mark the time to check event logs after reboot.  if it doesn't work should give you a starting point,

might run the BestPracticeAnalizer also.
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Rob Williams
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@R.Andrew Koffron I've done what you recommended several times and it's locked up each.

@Rob Williams I ran the VPN wizard from the right and then noticed there wasn't any network so I ran "Connect to the Internet" it came back and said it couldn't find the router, which is fine I added the IP for the router and server now it appears locked up the bar hasn't moved in 10 minutes.

I believe this has something to do with IPv6. There's no internet, there hasn't been and nslookup address shows IPv6 not IPv4 IP address.
whats in the event logs for Applications and System?
What did BPA recommend?
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update: nslookup didn't resolve because RRAS was on, I turned it off and everything works great now. Enable RRAS and DHCP and DNS go offline.

Thanks for IPv6 reminder, I didn't make any changes.
does your router have IP6 settings? ran across an article and someone resolved a similar issue by turning off IP6 settings on their residential router.
http://forums.whirlpool.net.au/archive/1851489
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May I ask why you are trying to enable RRAS in the first place?

Because if it's for VPN, on an SBS 2011 you shouldn't do this manually.  Instead, run the "Configure a Virtual Private Network" wizard found in the Console > Network > Connectivity

Doing this will ensure that all settings are correct for all services.
Thank you