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DHCP problem

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12 replies

by teinfo

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I got a problem to setup a new DHCP on a new NT server.

At DHCP Manager, I tried to add a address of DHCP server. When I click Ok. Error cameup as:

Unable to connect to DHCP server at x.x.x.x.
Server may be down, or DHCP service not started.

I checked DCHCP service is running and NIC is running also. IP already entered in DHCP Relay on TCP/IP properties.

Server runs on NT 4.0 with service pack 5.

One thing I supected:

When I installed NT, I could not install the NIC becausethe driver need sp5 or higher. So
I installed NT with MS Loopback Adapter, and then updated NT with sp5. I came back to install the NIC adapter and then removed MS Loopback Adapter.

Thanks

Edd

12 replies

by sp1906207

There's not enough information on the case.

1. Do you attempt to add an address of new
server in DHCP Manager on _another_
computer?
2. If (1)="yes" then can you PING you DHCP
server from this _another_ computer?
If you can't - then it's TCP/IP that
doesn't work, not DHCP itself.
3. If (1)="no" (i.e. you can't administer
DHCP server with local DHCP Manager) -
then can you add a "localhost"
or "127.0.0.1" instead of real IP?
If you can - then check, if the route
"x.x.x.x 255.255.255.255 127.0.0.1"
exists on this server (type "route print"
at command prompt) - where "x.x.x.x" is
it's real IP.
If it doesn't exist - add it (permanent)

by teinfo

Thank you very much for your response.
I setup a new PDC(domain)with DHCP. I used one workstation to test connect to this new PDC with WINS running, no problem.
1. No I am creating a new DHCP on a new domain PDC.

2. I can ping the PDC from this workstation computer. I can ping its localhost 127.0.0.1.

**I checked the event viewer. The is no error after reboot. DNS & WINDS are running.

If you need more information, please let know.

Thanks

by duskos

You don't need DHCP Relay Agent service when you are setting up DHCP service.
DHCP Relay Agent service is usually installed on remote subnets where it services DHCP requests from clients by relaying their requests to DHCP server on another subnet. This is needed when routers do not propagate DHCP traffic.
So, on your DHCP server, go to network properties and remove DHCP Relay Agent Service. Install only Microsoft DHCP Server service.

by teinfo

I removed DHCP relay Agent service. DHCP is still not functioning. I still could not add the DHCP address from DHCP manager. Where I should check for configurations.

Thanks a lot for following my question.

EDD

by paul.haigh

Edd,

I've recently had to set up a DHCP server and set it up using the following steps:

1. goto start>programs>admin tools

2. select DHCP manager

3. a two pane pop up DHCP manager screen will now appear, make sure local machine is highlighted

4. click server>add enter the ip address of the server with DHCP on (it doesnt have to be the same machine)

5. click scope>create and enter in the start IP (first in the range) end IP (last one), and if need be any that might be excluded
6. ammend the lease duration for that IP (the default is three days)

click you will be prompted that it will now activate click DHCP is now up and running!

Sorry if it is a bit of a suck eggs thing, i had to produce this to guide others through the process. So I hope it works!!!

Paul

by chris hirst

The problem is most likely to be with the bindings. As you have effectively changed your N.I.C. when you removed the loopback DHCP will not have any bindings to the replaced driver. Enable the DHCP binding in the appropriate tab on the network control panel and all should be well
regards

by chris hirst

The alternative to this is to remove the DHCP service, Restart the server, Add the DHCP service again, Restart server again and reapply SP5.
Note there is a bug in SP5 that will cause the P.D.C. to reboot from an audit failure if,
The event log is set to automatically delete old entries and it then fills up and if you browse the domain users for any reason eg: setting permissions on a workstation
The solution is to install SP6a

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