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DHCP Server disappeared.

All of a sudden around 8am yesterday DHCP server appeared to crash…it’s gone. Scope and reservation are gone – it says there is not DHCP Server. When I try to add it…it says it cannot connect to it. In services, DHCP Client is automatic/started and DHCP Server is Disabled/Stop. I restart DHCP Server and it starts and then stops.

SBS 2k3. No patches were installed during that timeframe.
Thanks.
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Blue Street Tech
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Blue Street Tech
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1 Solution
 
dmessmanCommented:
The issue of DHCP starting and then stopping immediately can be cuased by SBS 2003 seeing another DHCP server on the network (a wireless router for example that is giving out IP addresses).

Start the DHCP Server process and then check the event log.  It should tell you why it stopped.  If it's another DHCP server, you'll need to find it and eliminate it.
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Blue Street TechLast KnightsAuthor Commented:
@dmessman: Thanks for your response. I will test as you specified. The only other DHCP server is the SonicWALL WLAN but its on a separate network. I was reviewing the logs and there are rules setup to cross communication between the LAN and WLAN. Could this be the cause? It has been running like this for 5 yrs w/o issue.
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dmessmanCommented:
let's just test for now.  Start the DHCP server and see the event log to see if another DHCP server is why it's stopping.  I can't comment without knowing more of how your networking is set up.
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Blue Street TechLast KnightsAuthor Commented:
Yep. It failed due to another DHCP Server running on the firewall.
DHCP-Server-Errors.txt
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dmessmanCommented:
I can't speak for the last 5 years where it worked, but I can tell you that today it's not working.  

right now - let's disable the DHCP on the firewall and see if we can get DHCP working normally on the SBS box.  Your DHCP info probably hasnt' disappeared, it's just that you couldn't run the DHCP app becuase the DHCP Server service was stopped.  You'll probably see that back to normal.

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Blue Street TechLast KnightsAuthor Commented:
OK. You are speaking about disabling DHCP on the WLAN correct? It is already disabled on the LAN.

I will have to go on-site to execute. I should arrive around 12:30p. I will let you know once I execute. Thanks again!
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dmessmanCommented:
Now we have to work on the wireless issue.

It sounds like you have a Sonicwall firewall/wireless access point built into one device.  I don't use those generally.  Personally, I buy a stand alone wireless access point that gets a DHCP address from the server.  But either way, the real issue is that the Sonicwall is giving out IPs on the LAN.  You may intend for it only to be giving out wireless addresses, but the SBS box clearly sees the Sonicwall giving out addresses.  We'll need to fix that.
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Blue Street TechLast KnightsAuthor Commented:
You were correct...somehow the LAN DHCP Server was enabled on the SonicWALL...nothing in the Change Logs about that being enable...wierd. Disabled it and everything regenerated after starting the DHCP Server on SBS. Thanks again!
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