Results 1 to 3 of 3

Thread: ufw is blocking webcam when launching Webex meeting app from browser

  1. #1
    Join Date
    Apr 2021
    Beans
    2

    ufw is blocking webcam when launching Webex meeting app from browser

    Good morning everyone,

    My current OS is Ubuntu 16.04 LTS 64-bit. The current Firefox version is 87.0.

    I have been experiencing a problem with the Webex meeting app that is launched from Firefox. The problem is that I cannot receive or emit video from my laptop's webcam. I can hear everyone OK, they can also hear me, and I can see presentations and interact with meeting attendees. The problem is only the video. This is not a huge problem, but my boss gets a bit nervous when he cannot see me. So I want to get to the bottom of this.

    I have already installed the Cisco Webex extension on Firefox, installed ubuntu-restricted-extras as recommended by the Cisco Webex help center, troubleshoot my webcam with command
    Code:
    sudo modprobe -v uvcvideo
    .

    My Webcam has no issues, installing ubuntu-restricted-extras was a waste of time. Yet the video still does not work on the bloody Webex browser app .

    The good news is that I think I found the solution. When I disable ufw, everything works fine. Except that I had to disable the ufw. I was digging on the "Webex Meetings Web App Known Issues and Limitations" for clues about this, and I could find that Webex video uses ports UDP 9000 and TCP 5004. I immediately included these rules in my ufw but again went back to the frustrating video issue.

    So I am calling the forum for some help here.

    Thanks in advance for your attention. I could not find a similar thread. My apologies if this has been already solved.

    Best Regards,

  2. #2
    Join Date
    May 2013
    Location
    Galiza
    Beans
    4,010
    Distro
    Ubuntu

    Re: ufw is blocking webcam when launching Webex meeting app from browser

    Welcome.

    Ubuntu 16.04 will be EoL in a matter of days. There's no point in troubleshooting.

  3. #3
    Join Date
    Apr 2021
    Beans
    2

    Re: ufw is blocking webcam when launching Webex meeting app from browser

    Thank you CelticWarrior. You are right. So I upgraded to Ubuntu 18.04.05 LTS.

    And I finally found a solution to my problem. The problem was very silly actually. It turns out I was using the wrong command to allow ports UDP 9000 and TCP 5004. With commands
    Code:
    sudo ufw allow out 5004/tcp && sudo ufw allow out 9000/udp
    the camera is emitting video and I can see everyone ok. The 'out' part in the syntax is important. Perhaps there is a more secure way to do this?

    I hope this is helpful to someone

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •