TCPIP error 4199

Hi All,

I am facing a problem with DHCP.
In my network, the DHCP role is configured on my W2k3 server (it is also a domain controller, DNS server, Global catalog and Exchange server 2003)

All of my members server's have Fix IP configured on their local network cards.
The problem is that a few weeks ago I received some error messages at one of my members server telling me that TCPIP 4199.
I made an investigation, and it turned out that one of my user has an iPad4, and it is somehow trying to get the some IP (using DHCP) as one of my member server. I don't really understand why is that because the fix IP's (192.168.0.1 - 192.168.0.10) are configured as restricted area of DHCP and the available IP addresses are starting from 192.168.0.11 until 192.168.0.254.
What is happening with DHCP?
Can you help me pls?

P.s.: I have tryed already to change the member server's MAC address, and it won't help.

Thanks in advance.
agriboy1980Asked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

vverduraCommented:
Are you certain the iPad is asking for an IP to DHCP server?
Can you put an fixed IP address on it?
0
agriboy1980Author Commented:
Yes, I have already did that. It receives the give address successfully, but still receiving the IP conflict error message on member server's event viewer. (TCPIP error 4199)
0
agriboy1980Author Commented:
Furthermore I saw that both devices have the same first 2 characters in MAC address. So I was thinking maybe DHCP was confused a bit and tried to issue the same address for both of them. After I have changed one of the MAC address the problem persist.
I am clueless.
0
INTRODUCING: WatchGuard's New MFA Solution

WatchGuard is proud to announce the launch of AuthPoint, a powerful, yet simple, Cloud-based MFA service designed to eliminate the vulnerabilities that put your data, systems, and users at risk.

vverduraCommented:
The MAC can be equal at a certain point if the NIC has the same vendor.

If you put a fixed IP in iPad how can it ask for an IP? If you put an fixed IP certainly the issue dissapears. Are you putting the IP in the correct interface?
0
agriboy1980Author Commented:
Sorry, myabe you missunderstood me. I have fixed IP configured on the member server. The iPad is always asking for IP from DHCP, but i have already restricted a certain IP address for its MAC address and it receives it properly. The thing is that I still receive the IP confilict message on the member server's event viewer.
Why is that?
0
vverduraCommented:
Put a fixed IP in iPad and test if the Ip conflit appears. I doubt the issue is in iPad...
0
agriboy1980Author Commented:
Ok, will do it and post the results here.
Thx
0
CubeOverCommented:
I think you mean "IP reservation" for iPad, not IP restriction.
Have you checked that your reservation is not taken by another device on the network? Try pinging the IP when there is no iPad on the network. Better yet, have your DHCP server do the check for each lease it gives.
When you "reserve" an IP lease in DHCP server, you dictate what it should be, there is no check.
I would check DHCP server IPv4 Properties  - Advanced tab, and increase Conflict Detection Attempts from 0 to 1. And get rid of the reservation unless you serve something off your iPad (?) the less manual hacks you have the more maintainable your solution is.
0
agriboy1980Author Commented:
I am sorry to tell you but the error is still coming
0
Craig BeckCommented:
I made an investigation, and it turned out that one of my user has an iPad4, and it is somehow trying to get the some IP (using DHCP) as one of my member server.
What did you do to determine this, and how do you know for sure?
0
ArneLoviusCommented:
Put a reservation in DHCP for the MAC address of the iPad, then check that the reservation is in use.
0
agriboy1980Author Commented:
Hi.
I have already put a reservation for the ipad's MAC. It is receiving the reserved ip but i still receive the TCP/IP 4199 error message. Even tried to change the server's MAC to a totally different one but it didn't help me yet.
0
ComputerTechieCommented:
Are you using for WiFi have you check the WiFi router to see if it is not assigning the reserved addresses?

CT
0
agriboy1980Author Commented:
Yepp, all the wifi router's DHCP server option has been turned off at the configuration.
0
masnrockCommented:
Try manually setting the IP addresses on the member servers, then get rid of the DHCP reservations for the servers. After you do that,  let us know what occurs. You may also need to flush out the DHCP leases. And make sure you're using the original MAC addresses for the servers.
0
Craig BeckCommented:
There are only static IP addresses on servers already.
0
agriboy1980Author Commented:
I could try to delete the reservation for the server and re-create it.
Maybe i should put the server's network card to automatic configuration using DHCP instead of fixed ip, but i think this would effect the DNS role and some other rolls in a bad way
0
Craig BeckCommented:
When creating a DHCP scope it's good practice to include the whole IP range, and create exclusions for devices with static IP addresses, not MAC reservations.

This will ensure that the IP address which is assigned to a device will never be issued via DHCP, as someone could spoof the MAC address of a server (for example) in an attempt to receive it's IP address from DHCP.
0
agriboy1980Author Commented:
So this means I should clear out everything and re-create the IP-range including the FIXED ip servers ip addresses?
0
Craig BeckCommented:
No, you don't 'have' to clear everything out - it's just recommended to do it the way I suggested.

If you have a load of reservations for devices which have static IP addresses, just delete the reservations and create exclusion ranges for those IP addresses instead.
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
agriboy1980Author Commented:
Alright, will do it and post the results.
Thx
0
agriboy1980Author Commented:
ok, I did the flush out the DHCP leases.

So now i am waiting for the error to come.
0
ComputerTechieCommented:
Also clear the arp cache netsh interface ip delete arpcache

CT
0
agriboy1980Author Commented:
I have received a new error:

NetBT 4319
0
Craig BeckCommented:
That error means there are hosts with the same name on the network.

http://support.microsoft.com/kb/242053
0
agriboy1980Author Commented:
Ok, but i don't use WINS manager / role at all.
0
Craig BeckCommented:
It may 'actually' be a duplicate name on the network...
0
agriboy1980Author Commented:
How should i start the ivestigation?
0
masnrockCommented:
Since a member server is reporting that error, disconnect it from the network. Once you've done that, try pinging by machine name, then see what IP address comes up. That will tell you what machine is in conflict.
0
agriboy1980Author Commented:
It seems now that the above mentioned DHCP flush is helping to solve this issue.
Thanks guys.
Cheers
0
CubeOverCommented:
You could also try "Reconcile Database" operation on your DHCP server.
It was probably some corruption in the DHCP database.
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
DHCP

From novice to tech pro — start learning today.