When I come to my office, nearly every morning since a while, the server is kind of down. He is working fine but you can't log on it. In the event viewer, we have this: DHCP received an unknown option 044 of length 004. The Raw option data is given below... This always seems to happen overnight or when there is absolutely nobody on the network except three computer that are always on. This lead to a problem since our backup (ARC Server) don't work 'cause "the client failed to respond". I am not familiar with this. Any help would be welcome.

Are you running RAS? When you can't logon how do you fix it? Reboot your pc or reboot the server? When you can't logon and you do a ipconfig is your ip address valid and from dhcp? Tried reappling your service pack 6a???

We have a firewall and the remote users authenticate on the NT. Don't know about the IP address. Will look tomorow morning. When this happen, we just shutdown the server, the hub and the firewall then we restart the whole thing.

Is your firewall or NT providing dhcp addresses? Are your remote users vpning in? Have you looked at the firewall logs? This appears to me to be a possible denial of services attack.

Just the same as 'nimbus',I get this too every time i log on..it doesnt seem to be affecting my connectivity at all,and my dhcp is working like it's supposed to, but its been going on since i installed nt (the event viewer is just chock full of those 'unknown option length' errors, and the length appears to be the same as well) and i have no other protocols, myself, installed, (no RAS, in other words). hmmmmm.....

If you have DHCP and/or WINS running on a server with two NICS and one of them is connecting to the Internet you MUST go into network properties and remove the bindings for DHCP and WINS from the NIC that connects to the Internet. It can cause lots of funny problems if the binding is left in situ (which it will be by default).

Same message here, on a NT4 server with DHCP server (local) and DHCP client (to my ISP) NT4 is my router/proxy etc. The reason i get this message is because my ISP doesn't include the backup subnetmask in his DHCP broadcasts (it only send my IP/subnetmask/gateway and IP from DHCPserver) It leaves the backup subnetmask information blank, so every time my ISP renews my lease i get this message (16 times!) DHCP received an unknown option 000 of length 255 Remember this is only a warning and doesn't effect the working of your DHCP or NT. If your system 'hangs' every morning you should look for other more severe errors... And yes i unbound all DHCP/WINS connections from the NIC to my ISP, that's more for security reasons then bad DHCP working... Grtzz Piet