DNS & DHCP Troubleshooting

MSP Toolkit
Minimal guidance for messy support realities.
Networking

DNS & DHCP Troubleshooting

Browse issue-specific guidance for DNS & DHCP.

  1. Client receives APIPA address even though DHCP scope has free leases
  2. Conditional forwarder works from domain controllers but not DNS management test tool
  3. Conditional forwarder works on one server only
  4. DHCP failover pair healthy but one scope stops issuing leases
  5. DHCP lease updates fail after credential account lockout
  6. DHCP option for VoIP phones applies at headquarters but not branch scope
  7. DHCP reservations present but wrong scope hands out addresses
  8. DHCP scope has leases available but clients self-assign
  9. DNS & DHCP alerts indicate success while end-user experience never changes
  10. DNS & DHCP configuration survives testing but resets after restart or sync
  11. DNS & DHCP credential or certificate rotation breaks an existing integration
  12. DNS & DHCP feature works in web app but fails in desktop client
  13. DNS & DHCP healthy dashboard status masks a failing production workflow
  14. DNS & DHCP logging shows delivery yet the target workflow never completes
  15. DNS & DHCP new deployment works for pilot group but not for production rollout
  16. DNS & DHCP policy change applies in admin console but target users never receive it
  17. DNS & DHCP quarantine or protection action triggers but recovery workflow fails
  18. DNS & DHCP workflow succeeds for one account but fails for shared or delegated access
  19. DNS scavenging removes active record for appliance with static IP reservation
  20. DNSSEC validation breaks only one third-party SaaS domain lookup
  21. Guest VLAN clients receive lease but no DNS servers
  22. Internal DNS record resolves correctly on servers but not on Wi-Fi clients
  23. Internal DNS zone replicates but one domain controller serves stale records
  24. Internal website resolves to old server for one subnet only
  25. Printers renew DHCP but keep old DNS hostname
  26. PTR records missing and backup software fails verification
  27. Reserved IP address still handed to wrong MAC after device replacement
  28. Reverse DNS zone missing PTR updates for new Windows clients
  29. SaaS outage suspected but root cause is local DNS filter
  30. Stale CNAME causes intranet shortcut to bounce between old and new hosts