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

[Andrew O'Brien]

It has stopped connecting UDP today .

Andy K3UK

[UT4LW Yuri Pavlov]

Clicking the [Connect] button in the SmartSDR-API tab does not always show the connection for the UDP port.

The UDP port connection will only be enabled after the SDC requests data from the transceiver and this data begins to arrive at the UDP port. For example, turn on the skimmer. If the UDP port connection still does not appear, you need to find the reason why the system is blocking UDP.

среда, 14 января 2026 г. в 13:35:41 UTC+2, andre...@gmail.com:

[Andrew O'Brien]

Thanks,  it does not fully connect after I start SKM.  So, I will investigate why the Mac is blocking . 

73 de Andy K3UK 

[Andrew O'Brien]

This is what I find today , with SmartSDR and SDC running and SKM started , but no UDP 4995 started 

SmartSDR  1290   andrewobrien   19u  IPv4 0xbea6dda329a55ac9      0t0  UDP *:4991

SmartSDR  1290   andrewobrien   20u  IPv6 0x7ccf7e6f777655d3      0t0  UDP *:4991

SDC       1447   andrewobrien   56u  IPv6 0xed0d12dda5642c6c      0t0  UDP *:4995

Andy K3UK

[Andrew O'Brien]

Solved !  Having established that my router and UDP were set as expected , I checked SKM settings and discovered that the Control Type was set to TCI .  I changed it to SmartSDR API and port 4992  opened fully.

Andy K3UK