SBS2011 DHCP issue

Posted on 2014-02-18
Last Modified: 2014-03-04
We seem to be getting an intermittent problem with our DHCP service, in as much as every now and then we cannot get an IP address issued when a workstation logs in.

I looked at the event log, and saw this warning :-

Warning      18/02/2014 13:46:22  RPC (Microsoft-Windows-RPC-Events)      11      None

Possible Memory Leak.  Application ("C:\Windows\system32\mmc.exe" "C:\Windows\system32\dhcpmgmt.msc" ) (PID: 11604) has passed a non-NULL pointer to RPC for an [out] parameter marked [allocate(all_nodes)].  [allocate(all_nodes)] parameters are always reallocated; if the original pointer contained the address of valid memory, that memory will be leaked.  The call originated on the interface with UUID ({6bffd098-a112-3610-9833-46c3f874532d}), Method number (2).  User Action: Contact your application vendor for an updated version of the application.

Which seems to relate to a DHCP service???

Can anyone expand on this and provide any additional information as to what we need to do to resolve this issue, and whether you think it relates to our issue?

Many thanks.
Question by:nigelbeatson
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LVL 27

Expert Comment

by:Jason Watkins
ID: 39867438
The error looks like a memory leak from a certain application. Not sure if this has anything to do with your DHCP issue. Is the DHCP server service started when the outages occur. Does the DHCP pool have enough addresses to hand out for clients at these times?

Author Comment

ID: 39867492
Yes there are plenty of free IP's remaining in the scope.

The application is indicated as being "C:\Windows\system32\dhcpmgmt.msc" but I have looked at the DHCP application, and it "looks" OK??

It seems to be working OK at the moment, but we still keep getting this message in the event log. Not sure whether to be concerned or not??

Author Comment

ID: 39867517
I have also just noticed this in the system event log :-

Warning      18/02/2014 14:51:09      DHCP-Server      1056      None

The DHCP service has detected that it is running on a DC and has no credentials configured for use with Dynamic DNS registrations initiated by the DHCP service.   This is not a recommended security configuration.  Credentials for Dynamic DNS registrations may be configured using the command line "netsh dhcp server set dnscredentials" or via the DHCP Administrative tool.

Any ideas??

Many thanks.
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LVL 27

Accepted Solution

Jason Watkins earned 500 total points
ID: 39867558
In Windows networks, DHCP can be used update DNS with host name/IP address info that can be used to create the necessary A/PTR records in DNS. In order to do this, credentials must be set to allow this operation to happen.

See here:

Author Comment

ID: 39867604
Thankyou. I have now reset the credentials, and will let you know if this resolves the problem.

Many thanks.
LVL 27

Expert Comment

by:Jason Watkins
ID: 39867617
Sure. Glad to help.

Author Closing Comment

ID: 39903202
Thankyou. That fixed it for us.

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