Networking
DNS & DHCP Troubleshooting
Browse issue-specific guidance for DNS & DHCP.
- Client receives APIPA address even though DHCP scope has free leases
- Conditional forwarder works from domain controllers but not DNS management test tool
- Conditional forwarder works on one server only
- DHCP failover pair healthy but one scope stops issuing leases
- DHCP lease updates fail after credential account lockout
- DHCP option for VoIP phones applies at headquarters but not branch scope
- DHCP reservations present but wrong scope hands out addresses
- DHCP scope has leases available but clients self-assign
- DNS scavenging removes active record for appliance with static IP reservation
- DNSSEC validation breaks only one third-party SaaS domain lookup
- Guest VLAN clients receive lease but no DNS servers
- Internal DNS record resolves correctly on servers but not on Wi-Fi clients
- Internal DNS zone replicates but one domain controller serves stale records
- Internal website resolves to old server for one subnet only
- Printers renew DHCP but keep old DNS hostname
- PTR records missing and backup software fails verification
- Reserved IP address still handed to wrong MAC after device replacement
- Reverse DNS zone missing PTR updates for new Windows clients
- SaaS outage suspected but root cause is local DNS filter
- Stale CNAME causes intranet shortcut to bounce between old and new hosts