No UDP connection on Windows machine

[Bill K2PO]

This is an update to a post deep in an earlier thread, reporting that I'd achieved UDP connection with SmartSDR 3.9.19 by deleting all SDC Inbound rules in Windows firewall, and then giving the firewall permission to pass SDC packets the next time SDC was run.

That fix lasted only briefly, and I haven't been able to replicate it.

I've tried the usual - turning off the firewall (for public, private and domain networks), uninstalling and re-installing SDC, uninstalling SmartSDR and upgrading to SmartSDR4, restarting computer, changing UDP port to 4990 and creating a specific firewall Inbound rule to pass 4990 traffic, etc.

One post suggested *not* running SmartSDR, but running SDC by itself, and logging the TCP traffic as it tries to find SmartSDR (there should be "Discover" messages).  I did this and found no such messages.  FWIW, the contents of the TCP log file are below.

I'm running a Flex6500.  The Dell computer is running Windows 10 Pro, Version 22H2, OS Build 19045.6456

At this point I'm inclined to give up, and perhaps revisit when I eventually upgrade to a new Windows 11 machine.  But I wanted to memorialize my experience in case it is of use somehow.

/Bill, K2PO

++++++

> C11|client udpport 4990

< V1.4.0.0

H0DF4301A

< M10000001|Client connected from IP 10.110.120.130

< SDF4301A|radio slices=4 panadapters=4 lineout_gain=72 lineout_mute=0 headphone_gain=49 headphone_mute=0 remote_on_enabled=0 pll_done=0 freq_error_ppb=0 cal_freq=15.000000 tnf_enabled=1 nickname=K2POFLEX callsign= binaural_rx=0 full_duplex_enabled=0 band_persistence_enabled=1 rtty_mark_default=2125 enforce_private_ip_connections=1 backlight=50 mute_local_audio_when_remote=1 daxiq_capacity=16 daxiq_available=16 alpha=0 low_latency_digital_modes=0 mf_enable=1 auto_save=1 max_internal_pa_power=100 external_pa_allowed=1

< SDF4301A|radio filter_sharpness VOICE level=2 auto_level=1

SDF4301A|radio filter_sharpness CW level=2 auto_level=1

SDF4301A|radio filter_sharpness DIGITAL level=2 auto_level=1

SDF4301A|radio static_net_params ip= gateway= netmask=

SDF4301A|radio oscillator state=tcxo setting=tcxo locked=1

SDF4301A|interlock acc_txreq_enable=0 rca_txreq_enable=0 acc_tx_enabled=1 tx1_enabled=1 tx2_enabled=1 tx3_enabled=1 tx_delay=0 acc_tx_delay=0 tx1_delay=0 tx2_delay=0 tx3_delay=0 acc_txreq_polarity=0 rca_txreq_polarity=0 timeout=0

SDF4301A|eq rx mode=1 63Hz=10 125Hz=10 250Hz=10 500Hz=10 1000Hz=10 2000Hz=10 4000Hz=10 8000Hz=10

SDF4301A|eq rxsc mode=1 63Hz=0 125Hz=0 250Hz=0 500Hz=0 1000Hz=0 2000Hz=0 4000Hz=0 8000Hz=0

< R11|0|

> C12|sub client all

< R12|0|

> C13|sub slice all

< S0|interlock tx_client_handle=0x00000000 state=RECEIVE reason= source= tx_allowed=0 amplifier=

< SDF4301A|waveform installed_list=

R13|0|

> C14|sub spot all

< R14|0|

> C15|sub pan all

< R15|0|

> C16|sub cwx all

< SDF4301A|cwx wpm=28 break_in_delay=0 qsk_enabled=1

< R16|0|

> C17|sub tx all

< SDF4301A|transmit tx_rf_power_changes_allowed=1 tune=0 tune_mode=single_tone mon_available=1 max_power_level=100

< SDF4301A|transmit freq=7.022840 rfpower=0 tunepower=0 tx_slice_mode=CW hwalc_enabled=0 inhibit=0 dax=0 sb_monitor=0 mon_gain_sb=80 mon_pan_sb=50 met_in_rx=0 am_carrier_level=100 mic_selection=MIC mic_level=40 mic_boost=1 mic_bias=1 mic_acc=0 compander=1 compander_level=70 vox_enable=0 vox_level=50 vox_delay=13 speech_processor_enable=1 speech_processor_level=0 lo=100 hi=2900 tx_filter_changes_allowed=1 tx_antenna=INVALID pitch=600 speed=30 iambic=1 iambic_mode=1 swap_paddles=0 break_in=1 break_in_delay=5 cwl_enabled=0 sidetone=1 mon_gain_cw=14 mon_pan_cw=50 synccwx=1

SDF4301A|eq tx mode=1 63Hz=10 125Hz=6 250Hz=6 500Hz=11 1000Hz=14 2000Hz=16 4000Hz=15 8000Hz=12

SDF4301A|eq txsc mode=1 63Hz=0 125Hz=-4 250Hz=-4 500Hz=1 1000Hz=4 2000Hz=6 4000Hz=5 8000Hz=2

< SDF4301A|interlock acc_txreq_enable=0 rca_txreq_enable=0 acc_tx_enabled=1 tx1_enabled=1 tx2_enabled=1 tx3_enabled=1 tx_delay=0 acc_tx_delay=0 tx1_delay=0 tx2_delay=0 tx3_delay=0 acc_txreq_polarity=0 rca_txreq_polarity=0 timeout=0

R17|0|

> C18|sub dax all

< R18|0|

[UT4LW Yuri Pavlov]

Bill, connect the transceiver to your computer's LAN port and make sure all programs are working. Let us know the result.
I think the problem is with your network settings.

Show the SDC-SmartSDR-API tab image

суббота, 1 ноября 2025 г. в 18:21:37 UTC+2, Bill K2PO:

[Bill K2PO]

Yuri,

If I understand you correctly, you want me to disconnect the computer LAN cable from the network switch, and disconnect the Flex6500 LAN cable from the network switch, and instead connect the computer and Flex LAN ports directly together with a CAT5 cable.

When I do this, nothing happens when I try to Connect the SmartSDR API Client.  The TCP log shows no activity.  The connectivity icons on the TCP and UDP lines of the UI continue to show red-X icons.

Here's a screenshot before I attempt the connect:

And here's a screenshot after I attempt the connect:

The result is the same if I change the Host/NickName to K2POFLEX - the nickname given to my Flex.in the Radio Identification UI of the Flex radio setup.

Tnx,

/Bill, K2PO

[UT4LW Yuri Pavlov]

Do not enter "Localhost" - this is not the name of your transceiver.

Once again, connect the transceiver to the computer's LAN port.

Try entering the IP address of your transceiver. For example:

Or do as shown in this video: https://www.youtube.com/watch?v=jWF9MoErNeY

суббота, 1 ноября 2025 г. в 20:31:16 UTC+2, Bill K2PO:

[Bill K2PO]

RR.  Did as instructed.  Again, TCP connection established, but not UDP.  (I turned off Windows firewall, just to take that variable off the table.)

Screen shot below:

Tnx,

/Bill, K2PO

[UT4LW Yuri Pavlov]

Bill, you haven't started any processes in SDC that request UDP data. That's why the UDP icon doesn't show a connection. Turn on the skimmer, or just check one of the "Auto..." boxes.

Please watch the video carefully.

[Bill K2PO]

That seems to have fixed it.  I left those unchecked simply to keep things as simple as possible.

Many tnx,

Bill