pjhtech ToolsUniFi VLAN SSID Not Getting an IP Address
Configure the SSID VLAN and trace missing DHCP through AP native/tagged ports, switch uplinks and the gateway while preserving AP management.
Practical guideUbiquiti UniFi Network Guides
Troubleshoot adoption, VLANs, DHCP, PoE and Wi-Fi; configure routing, isolation and service discovery.
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Troubleshooting / Common problems
UniFi Port Forwarding Not Working: NAT and Return-Path Checks
Trace failed UniFi port forwards through CGNAT or double NAT, WAN selection, the server listener and the return route.
Practical guideUniFi Adoption Failed or Stuck Adopting
Check Network application compatibility, management VLAN, TCP 8080 reachability and previous management before resetting an AP or switch.
Practical guideUniFi Duplicate IP Address or Rogue DHCP Warning
Investigate “Multiple devices are using the same IP address”, static addresses inside DHCP pools and DHCP Guarding without blocking the legitimate server.
Practical guideUniFi AP Reboots or Goes Offline: PoE and Uplink Checks
Use AP uptime, PoE events and link changes to distinguish power loss, cable faults and management connectivity failures.
Practical guideUniFi mDNS: AirPrint or AirPlay Missing Across VLANs
Separate service discovery from the application connection, scope the mDNS proxy and diagnose IoT discovery without opening every inter-VLAN service.
Practical guideUniFi STP Blocked Port or Network Loop Warning
Distinguish normal RSTP redundancy from Loop Protection or BPDU Guard shutdown, inspect wired and mesh paths, and recover without disabling loop protection globally.
Practical guideUniFi Ethernet Uplink Stuck at 100 Mbps
Diagnose FE instead of GbE on an AP, switch or gateway: verify negotiated speed, isolate cable and port faults, and separate link rate from Wi-Fi throughput.
Practical guideConfiguration & CLI guides
UniFi WiFi Problems: IoT Connection, Slow Speed and Roaming Fixes
Fix legacy IoT connection failures, congested channels, unintended speed limits and poor client coverage with the relevant UniFi setting.
Practical guideUniFi Guest Isolation Not Blocking Local Devices
Block Guest access across VLANs and between clients on the same VLAN, while keeping intentional Trusted-to-IoT exceptions.
Practical guideUniFi: Allow One Trusted-to-IoT Service and Block the Rest
Create a specific trusted-to-IoT service allowance, order stateful replies and blocks, and keep gateway services separate.
Practical guideCollect the right diagnostic evidence
Find the correct SSH access, choose a packet-capture point, check management traffic and collect a support file. UniFi diagnostics and EdgeRouter commands have separate sections so that examples stay with the right product family.
Browse Ubiquiti diagnostic references