DHCP server does not assign IP and Yellow Exclamation mark

Question

Good Day, I am experiencing a bit of a problem with my DHCP Server (Windows Server 2012 R2). For some reason it is displaying yellow exclamation icons next to the server and scope tree items. When this happens, no new machines can connect to the network and automatically receive an IP address. My only way around this is to enter a static IP on the new machine, that does not appear in the DHCP servers Address Leases list. This seems rather strange as I can see gaps in the leased IP range but these are not being assigned automatically and the laptop does not complain when I enter it manually so it is not in use. Can anyone offer some advice or attempt to point me in the right direction.

 

Kind Regards,

 Rose

Answer 1

Hi

if you run through the steps in this article, it may give you some assistance:

https://learn.microsoft.com/en-us/training/modules/troubleshoot-premises-hybrid-networking/2-diagnose-dhcp-problems?

In particular, check the DHCP Logs in both Event Viewer and the files themselves as this will point you to exactly what the issue is. Do this on both Client and Server.

Please post back if you need further assistance

Hope this helps,

Thanks

Michael Durkan

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Answer 2

Hello there,

This may indicate that there is an error with the ability of the DHCP server to lease addresses (not always that "all are used", but "there are none available" instead). My recommendation is to check if the DHCP Scope has been deactivated for any reason. This is usually the most frequent problem, and just Activating the Scope will resolve it.

As for the DHCP warning mark, that usually means 90% or more of your addresses are being leased out. Might be a good idea to shorten lease times or use a larger pool.

Hope this resolves your Query !!

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