UniFi Controller is a piece of software that can be installed on-premises or in the cloud that allows you to manage UniFi access points, enable guest users to connect to your SSID (Service Set Identifier), and monitor network usage remotely.

However, the UniFi Controller startup failed issue always appears when users try to update the UniFi Controller software or a few minutes after starting the software.

Well, what triggers the UniFi Controller startup failed issue? According to investing, we find several possible reasons.

Insufficient free space on the host system disk.
Incompatible or outdated JAVA installation.
There are special characters in the Windows profile username.
The UniFi Controller does not have the required ports.
Database corruption.
Broken UniFi protocol.
Temporary bugs in UniFi Controller software.
Based on these reasons, there are several methods to the “UniFi controller startup failed” issue.

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