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DAX and CAT random disconnects

Suddenly, CAT and DAX randomly disconnects....I have checked the firewall settings....uninstalled SmartSDR.....reinstalled, reset the 6700.....problem doesn't go away


  • Mike-VA3MW
    Mike-VA3MW Administrator, FlexRadio Employee, Community Manager, Super Elmer, Moderator admin

    A few things

    Is this a local or remote connection?

    You confirmed that the problem isn't the software on the radio or on the computer as you have reinstalled it. So, we need to further.

    Random disonnects are 99% related to network communications.

    Try this--assuming local connection:

    • Turn off the windows firewall and test
    • Watch the Windows resource monitor and see if the computer is busy at times. This can cause network dropouts and DAX and CAT disconnecting

    Try a link.local connection and see if the problem still exists.

    1. Turn off the PC
    2. Turn off the Radio
    3. Connect CAT cable
    4. Turn on the PC
    5. Turn on the Radio
    6. Start SmartSDR
    7. Connect to the radio
    8. Test as required.

    If it goes away, then you have a networking issue. Try new cables and maybe a different switch.

    Did something change in your network?


  • WA5YOM
    WA5YOM Member ✭✭

    I had already done all that......turned off firewall...anti spyware real time.....new cables months ago....

    new computer months ago (latest DELL XPS).....

    It is staying connected better at the moment...but now DAX say no RX stream present when there is...

  • Mike-VA3MW
    Mike-VA3MW Administrator, FlexRadio Employee, Community Manager, Super Elmer, Moderator admin

    You may wish to open a support ticket. They can help you out.

    If you did the link.local test, please pass on the results as it really helps to narrow things down.


  • Rich McCabe
    Rich McCabe Member ✭✭✭

    I am having the same issue via Smartlink which is re recent issue. Have to close everything and re-open and works fine. My biggest issue is TX with WSJT-X. Will key radio, DAX panel shows signal but no power out. Can hit Tune on WSJT and still now power out. Have to restart. Sometimes even reboot 6600. Just upgraded to new 3.4 and hoping that helps.

  • George M.
    George M. Member ✭✭

    Having the same issue, DAX disconnects. Have to shut down the 6600 to get DAX to reconnect from yellow to Blue.

    George N1naz

  • Mike-VA3MW
    Mike-VA3MW Administrator, FlexRadio Employee, Community Manager, Super Elmer, Moderator admin

    This is one of those things were the symptom and the root cause are often different things, so it requires some further digging to find out what is actually causing the problem.

    This is one of the reasons we ask you to try the link.local test and see if the problem changes in any way.

    We have also seen a LOT of Gigabit switches that just don't work as well as 100mb switches when streaming data all the time. It is often called 'flapping'. That is a real technical term actually -- it is like a rapid reboot. When this happens DAX can drop its connections if the UDP packet stream gets fractured enough. DAX can then get messed up drop its connections. This could require a restart of DAX.

    If you can test on a 100mb switch and see if it gets better, that is also a good data point.

    If you watch your network health icon in SmartSDR and it shows some higher latency's on a local network then you do have some network issues that need resolving.

    Make some changes and tell us what you see and we can try to help you out.


  • George M.
    George M. Member ✭✭

    Hi Mike,

    Running Link.Local now, we will see.

    I have 2 ethernet ports on my computer, I am running the Flex

    6600 into one port and the house/internet into the other. Can I somehow still

    access the Flex 6600 from a remote SmartSDR session through my PC?

    If you want to take this off community e-mail me at n1naz at


    George N1NAZ

  • Mike-VA3MW
    Mike-VA3MW Administrator, FlexRadio Employee, Community Manager, Super Elmer, Moderator admin

    Hi George

    You can, but you will need to set up Windows Internet Connection Sharing.

    The purpose of this test is to help narrow down where the problem might be.

    And, we do want to leave it here so others can learn from.


  • Ed Stallman
    Ed Stallman Member ✭✭

    Same here , have to shut everything down and reload and I'm good to go until the next time . This problem came with 3.4.21 ... I only log on to the community to see if others have the same issue


  • George M.
    George M. Member ✭✭

    Ok so, after a couple of days it did it again, this time in Link.Local. Had to re-boot the computer and the Flex to get DAX to reconnect.

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