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Wired Networks Thread, DHCP server alert in Technical; We have a strange problem with our DHCP server (Server 2008 R2), in the DHCP console the IPv4 icon is ...
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    DHCP server alert

    We have a strange problem with our DHCP server (Server 2008 R2), in the DHCP console the IPv4 icon is displaying a blue circle with an exclamation mark. According to Microsoft this means that our scope is fully used up, but looking at the statistics 73% of addresses are available. I've stopped and restarted the DHCP service on the server but it has mad eno difference. Is there anything else I can try?

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    Check current address leases. There might be a few bad_addresses which are sitting on an IP address but don't count within the statistics.

    Solution: Increase your DHCP scope.

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    There were a few bad_addresses but only about 5 or 6. There are plenty of ip addresses still available, 617 used 1687 available.

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    Just deleted some exclusion ranges and stopped and restarted DHCP again and now have a nice green tick, still not sure why I didn't when the exclusion ranges were present. I might try re-adding the exclusions and see if it breaks again.

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    It's now back to the blue exclamation, anybody have any ideas of what else I can try?

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    Are your exclusions taking up a significant portion of your DHCP leases?

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    Not now, I've removed them all apart from one range of 254 addresses, which still leaves of 1500 addresses available.

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    What does event viewer say?

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    A few errors in event log relating to dhcp.

    Event ID:1056 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.
    Event ID:1070 Iashlpr initialization failed: The DHCP service was unable to access path specified for the audit log.
    , so DHCP server cannot talk to NPS server. It could be that IAS service is not started.
    Event ID:10020 This computer has at least one dynamically assigned IPv6 address.For reliable DHCPv6 server operation, you should use only static IPv6 addresses.

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    10020: Are you using IPv6? If not, this error is fine.
    1070: Do you have Network Access Protection enabled or disabled? If enabled, you have a problem. Try disabling it.
    1056: Check that DHCP can dynamically update DNS. Check which user DHCP server service is running under. Should be 'Network Service'

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    badders (9th March 2012)

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    Not using IPv6, DHCP server service is running as Network Service (still have warning 1056), we're not using NAP but I disabled it on the scope and that seems to have fixed the problem. I'll keep an eye on it for a while and see what happens, looking good so far.

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    Looks like it was the NAP settings, not been any more problems today.

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    Good to hear.

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