UniFi Video 3.9.4 Release

by Ubiquiti Employee 2 weeks ago - last edited yesterday

System Requirements

  • NVR appliance or a 64-bit OS from the Files section below
  • Intel Atom D2500 CPU
  • 100GB HDD
  • 4GB RAM
  • Google Chrome
  • 500GB HDD or larger
  • RAM Disk for Windows installations - How-To


Important Notes

  • Cloud alerts for NVR Disconnects & Reconnects have been temporarily disabled.  We will be looking to re-enable these alerts later this week (Week of March 12th, 2018) to allow users some time to upgrade from 3.9.2/3.9.3 to 3.9.4 which has a fix for the repeated notifications. Motion and camera disconnect alerts remain enabled
  • All Linux commands below are for the NVR appliance and Debian 7. Different Linux distributions will have slightly different commands
  • Your Ubiquiti Account (SSO) is the same account you use to login to the community forum. If you want to use a different account for UniFi Video, first log out of the community before setting up UniFi Video for cloud access
  • Systems that are not the hardware NVR (airVision-C or UVC-NVR) must have some form of an NTP daemon installed to prevent timestamp and time synchronization errors



  • Windows: Run Installer as Administrator
  • Hardware NVR/Debian Install manual installation (other Linux files are linked at the bottom of this post, simply change the URL and filename to the appropriate operating system):
    wget https://dl.ubnt.com/firmwares/ufv/v3.9.4/unifi-video.Debian7_amd64.v3.9.4.deb
    sudo dpkg -i unifi-video.Debian7_amd64.v3.9.4.deb 


Cloud Setup

New Installations

  • Visit https://video.ubnt.com using Chrome from a computer on the same network as your UniFi Video installation.


  • Connect to your NVR locally (over HTTPS using the server's IP address on port 7443), then click 'Connect To My Ubiquiti Account' under NVR Settings.



Change Log 

System and Configuration

  • To reduce disk I/O on NVR appliances, UniFi Video logs for all Linux installations are now symbolic links to the data mount point (e.g /srv/unifi-video/logs). They remain accessible from /var/log/unifi-video but are no longer directly written to that partition.


Camera Firmware

  • No change: bundled version 4.2.13



New version 1.0.31

  • Improved security for storing RTSP passwords




  • N/A

Security improvements:

  • N/A

Bug Fixes:

  • Fixed cloud connection failure due to timeouts when UniFi Video is restarted, including after a software upgrade
  • Fixed zero length recordings caused by recording events surge

Web Interface


  • N/A

Bug Fixes:

  • Fixed error 404 dialog showing when it shouldn't during software update transition to "INSTALLING"



  • We are currently testing a fix for the following issues to be part of our next 3.9.x patch release

    • In some cases, motion recordings length shown in the recording list doesn't match the recording duration in the player
    • Minimum Motion Event Trigger (MMET) is not accurate in some cases which leads to false positives. We are currently testing an improvement after fixing a bug in the camera firmware
  • This release fixes the NVR to cloud connection timeouts that caused the NVR to be disconnected and stuck in a connection retry loop
    • Please note the connection may still fail due to other legitimate reasons. After several disconnections within a period of 15 minutes, the NVR is rate limited, which means further connection attempts may be delayed until the 15 minutes period is over and reset. We are working on improving notifications to the web application for better feedback on the cloud connection status
  • Minutes between alerts for non-cloud connected installations has a minimum of 5 minutes.  We are evaluating the most intuitive way to handle the various scenarios of upgrades and switching between cloud and non-cloud connected systems
  • We are aware of some issues with the iOS app and have addressed it by rolling back to a known working version on as many models as possible.
    • iPhone X users will continue to experience audio issues for the time being, we will be working as quickly as possible to resolve this as well as incorporate the full support for new camera models in the form of iOS App updates.


Port Forwarding/Custom Ports

If not using Cloud login, please check this article for required open ports and customizing ports





This release was pulled in light of the cloud connection issues.


If you are running UniFi Video 3.9.4 and would like to revert to 3.9.3, please see this post for details and instructions.

*Cloud functionality is peer-to-peer. All video is encrypted and not stored on our servers.

**These are the only officially supported Windows operating systems