DHCP Not Handing Out IP Addresses

dennisboyd · 2013-11-12T16:23:42.000Z

One of my DCs stopped handing out IP addresses this morning, restarted DHCP and the server to no avail.

I’m not out of IP addresses, today is patch Tuesday and an update was installed this morning, I uninstalled it and restarted the server but still no dice.

Event Viewer shows two error codes for DHCP, 20090 which states that DHCP was unable to bind to UDP 67 as it is being used by another application, and 1041 which says that none of the active interfaces have statically configured IPv4 addresses or there are no active interfaces. I do have the IP configured statically, it’s been working fine and hasn’t changed and the connection on the server itself is working just fine. As for UDP 67 I couldn’t find a single thing running on that port using netstat.

The only thing I’ve found online to try is recreating the DHCP scope, but I don’t want to do that unless I have to, and I actually have two scopes because of a VLAN and neither one is working, so I wouldn’t think it would be the scope itself.

Ideas?

wrx7m · 2013-11-12T16:37:07.000Z

Which update was it?

dennisboyd · 2013-11-12T16:38:41.000Z

KB2647170. It didn’t have anything to do with DHCP, but I uninstalled it anyway.

craigduff · 2013-11-12T16:39:53.000Z

The message with 1041 makes me wonder if there are any bindings for DHCP.

Under DHCP check the properties of IPv4, Advanced Tab, Bindings… button.

dennisboyd · 2013-11-12T16:40:44.000Z

The IP address shows up there, but the box is unchecked - checking it and hitting ok doesn’t change anything

craigduff · 2013-11-12T16:41:36.000Z

Now that it is checked, restart the DHCP service.

dennisboyd · 2013-11-12T16:42:04.000Z

I had noticed that before but didn’t know if it should show up checked; looking at another of my DHCP servers I see it is checked there.

dennisboyd · 2013-11-12T16:42:44.000Z

When I check it and open it back up it’s unchecked again, it’s like it won’t stay bound or won’t accept the binding

dennisboyd · 2013-11-12T16:43:49.000Z

Like I said before nothing showed up on netstat on 67

cybersharktech · 2013-11-12T16:48:15.000Z

Yeah, I went back and re-read your post, and Deleted mine till I could think of a better take on the problem. This honestly sounds like a Hardware issue. Have you tried rebooting the machine? (I’m concerned for the sate of the Nic card). What does Device Manager say about the Nic? Maybe try re-installing it?

dennisboyd · 2013-11-12T16:48:46.000Z

However, apparently something was binding it, even if it wasn’t active. I stopped a service associated with a switch monitoring tool I recently installed and the binding stayed, addresses are being handed out.

Thanks for getting me through another mini-crisis Spiceheads!

cybersharktech · 2013-11-12T16:49:24.000Z

Glad you found it! Really strange it didn’t come up in the Netstat then!!