UniFi - What log files exist and where can I view them?


This article will show users where to find their log files and how to view them for the different UniFi elements: Access Points, Switches, Security Gateways and Controller. Log files are essential to any support or troubleshooting needed, so it is important to know how to find them for all devices.

Table of Contents

  1. Log File Location
  2. How to View Log Files: UniFi APs and Switches
  3. How to View Log Files: UniFi Security Gateways
  4. How to View Log Files: UniFi Controller
  5. How to Download Encrypted Log Files from UI
  6. Related Articles

Log File Location

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NOTE: The symlink directory for Linux is mentioned below as it is the consistent folder location on the officially supported distros. It is the same whether you install the controller on your own installation of Debian or Ubuntu, or if it's on the UniFi Video NVR appliance or UniFi Cloud Key. Depending on the platform being used, and how it is configured, there will be other locations, but no matter what, on the supported distros, /usr/lib/unifi/logs will always contain the files.

There are three locations where you can view log files related to UniFi devices and the Controller: /var/log/messages, server.log, and mongod.log. See below what you will find in each.

1. UniFi AP: contains info local to UniFi Access Points, like 802.11 info


2. UniFi Switch: contains info local to the switch, like port link state changes, spanning tree events, etc.


3. UniFi Security Gateway: contains USG’s local logs, including DHCP, VPNs and more.


4. UniFi Controller:

  • Contains information about controller software, communication with UAPs, etc:
  • Contains information about UniFi software local to PC controller.

How to View Log Files: UniFi APs and Switches

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To view log files under UAP and USW:

1. Connect to UAP or USW via SSH
2. Type

cat /var/log/messages

3. View output 

To view the live logs, with output updating in your SSH session as new logs are appended, run the following instead of the above cat command.

tail -f /var/log/messages

How to View Log Files: UniFi Security Gateways

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To view log files under a USG:

1. Connect to the USG via SSH
2. In the EdgeOS CLI, the log can be viewed by running:

show log

3. It can also be viewed from the Linux shell using cat or tail as described above for UAP and USW. Run the following from the EdgeOS CLI to reach a Linux shell.

sudo su

4. Then the cat and tail commands listed above for UAP can be used.

NOTE: Firewall logs aren't in the UI yet. Please see this Community post for more details.  

How to View Log Files: UniFi Controller

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Logs can be viewed under the Insights section within the Controller. Click the dropdown in the top left and select "Controller Logs." Once the logs start populating there are options to fetch more logs or download the log file. 

Path to view logs on UniFi Controller is dependent on platform:

  • Windows: C:\Users\<username>\Ubiquiti UniFi\logs\
  • Mac OS X: /Users/<username>/Library/Application\ Support/UniFi/logs/
  • UniFi Cloud Key and Debian/Ubuntu Linux*: /usr/lib/unifi/logs/ 

How to Download Encrypted Log Files from UI

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The UniFi Controller also allows users to download log files to share with Ubiquiti support, but these logs are encrypted (for security reason), so as the user, you wouldn't be able to view the logs. For viewing we continue to suggest all the options described above. It is important to note that this support file does not include device logs.

In the UniFi Controller go to Settings > Maintenance and under the Support Info section you can click the Download Support Info button.

Related Articles

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