SDC lost TCP UDP contact suddenly .

[Andrew O'Brien]

After SDC for Mac OS working very well for the NA contest it suddenly  failed to connect these ports when I rebooted after a contest break . I rebooted the Mac Min M2 several times,  did several reboots of the Flex 8400 after closing it for a couple of minutes and I rebooted my Internet router.  Still no TCP  or UDP connection . The Flex is connected to my router  and SDC and Mac are on WI-FI and has been working well.

Andy K3UK 

[Andrew O'Brien]

SDC  does connect to the UDP and TCP ports if I use the Windows version but no longer if I use the Mac Mini M2 .  Alas, my cheap mini PC with Windows and a N95 processor is too slow to handle SDC with SKM .  So, I would still like to find a way to get  SDC for Mac connected again.  Anyone have suggestions ?

Andy K3UK 

[UT4LW Yuri Pavlov]

Try connecting the transceiver directly to the computer.

I don't see any problems. Take a similar picture.

воскресенье, 11 января 2026 г. в 23:18:03 UTC+2, andre...@gmail.com:

[Andrew O'Brien]

Thanks Yuri , I will try that later today .  I don’t know whether ChatGPT can be trusted to be accurate about this , but it suggests that something may have caused Mac OS to quarantine the SDC’s use of UDP and TCP.  

Andy

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[Doug - KD9PK]

Andy,

I'm running an iMac but experience the same TCP or UDP problems from time to time. 

I have not found the cause but I have found that restarting the computer will clear whatever is causing the TCP or UDP to stop talking. All I am fairly sure of is it internal to the computer/program, not in the network, as resetting the network has no effect.

[Andrew O'Brien]

Yuri, here is the screenshot you requested .  This is with the Flex 8400 connected directly to the Mac Mini M2 not to a router.

73 de Andy K3UK

[Andrew O'Brien]

Thanks Doug , I tried rebooting the Mac mini several times

Andy K3UK

[UT4LW Yuri Pavlov]

Andy, I want to see the "General" tab in the transceiver settings, as I showed in the picture.

понедельник, 12 января 2026 г. в 23:34:26 UTC+2, andre...@gmail.com:

[Andrew O'Brien]

Yuri, I think this is the one you requested .

73 de Andy K3UK

[Andrew O'Brien]

Yuri, it suddenly started working on my Mac today !

Andy K3UK