DHCP-Server Event ID 20287/1342 Not True, but causing problems

Question

_{Thursday, April 14, 2016 3:33 PM}

Howdy!

This is a weird one I can't find anyone else to have had this problem so I can't find any answers online.

I have a Server 2012 R2 VM running on ESXi 6.  My DHCP scope (named just "DHCP") is 10.10.0.11 through 10.10.0.100.  All green checkmarks, looks happy.  The "Display Statistics" currently shows 98 IP's available, or 89% available, so clearly, I have available IP's for DHCP to dish out.

However, nothing on my network will obtain an IP address automatically.  I can connect to my wireless network just fine, but end up getting an APIPA address every time.  However, I can set the IP address manually and it works.  I've scoured the web searching for answers on why my DHCP server just quit handing out IP's (because it WAS working fine when I first set it up about a month or so ago).  Yes, I've tried restarting the server, DHCP services, disabling firewall, uninstalling AV, checked BPA's and corrected them, verified NPS is not getting in the way, everything.

I then noticed in Server Manager that for DHCP Events, this event will log a few times a day:

ID: 1342 - IP address range of scope DHCP is out of IP addresses.

Then also, looking in Event Viewer > Applications and Services Logs > Microsoft > Windows > DHCP-Server > Microsoft-Windows-DHCP Server Events/Admin, I see this event logged over and over almost nonstop:

ID: 20287 - DHCP client request from ##### was dropped since the applicable IP address ranges in scope/superscope DHCP are out of available IP addresses. This could be because of IP address ranges of a policy being out of available IP addresses.

Again, to confirm, my DHCP scope says it has 98 available IP's, so clearly it is not out of IP's.  But, it appears that it thinks it is and is indeed dropping requests, which is most likely the reason why none of my devices can obtain an IP address automatically anymore.

Any ideas out there on why this is happening or a fix to the problem?

Thanks and muchly appreciated!

Joshua

All replies (1)

_{Friday, April 15, 2016 5:38 AM ✅Answered}

Hi Joshua,

>>My DHCP scope (named just "DHCP") is 10.10.0.11 through 10.10.0.100.  All green checkmarks, looks happy.  The "Display Statistics" currently shows 98 IP's available, or 89% available, so clearly, I have available IP's for DHCP to dish out.

According your description,I think there is something weird.Your scope is from 10.10.0.11 to 10.10.0.100,total addresses is 90,how could it be 98 available?It may caused by virus or service-level issue.You could try to perform a full system scan.Or recreate the scope,even recreate the DHCP service.

  Best Regards,

Cartman

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