Ubiquiti UniFi Error Code AP-Heartbeat Missed: How to Fix It

Q: What causes UniFi AP-Heartbeat Missed errors?

This error is typically caused by network connectivity issues, incorrect inform URL settings, MTU size mismatches, firewall blocking, or controller being offline or unreachable.

Q: How often should UniFi APs send heartbeats to the controller?

UniFi access points typically send heartbeat signals to the controller every 10 seconds. If the controller doesn't receive these signals, it will show the AP as disconnected.

Q: Can I fix this error without resetting my AP?

Yes, most heartbeat issues can be resolved by checking network connectivity, verifying the inform URL, adjusting MTU settings, or updating firmware without needing to reset the access point.

Q: Why does my AP keep losing connection to the controller?

Persistent connection losses are often caused by unstable network connections, power issues, outdated firmware, or network configuration problems like VLAN misconfigurations or firewall blocks.

Q: What is the correct inform URL format for UniFi controllers?

The standard inform URL format is http://controller-ip-address:8080/inform for local controllers, or the specific cloud controller URL if using Ubiquiti's cloud hosting service.

Abstract

The UniFi AP-Heartbeat Missed error occurs when your access point loses communication with the UniFi controller, typically due to network connectivity issues, incorrect inform URL settings, or MTU size problems. This error prevents proper management and monitoring of your access point through the controller interface.