Having issues getting N1MM Logger+ to properly interface with WSJT-X for upcoming ARRL DX CW. Default port 2237 should match between WSJT-X and N1MM+, but getting intermittent connection drops during busy band periods. Has anyone experienced similar UDP communication issues?

Running N1MM+ 1.0.9789 with WSJT-X 2.6.1 on Windows 11. CAT control works fine through DXLab Commander setting, but the logging integration keeps failing. Mode control is set to AFSK-R for the IC-7300 per documentation.

Are there any known workarounds or specific firewall configurations that resolve this? Really need this stable for contest operation.

Check your Windows firewall settings - N1MM+ and WSJT-X both need UDP exceptions. For SO2R setups, Radio #2 needs port 2239 but sounds like you're running SO1R. Also verify you don't have "Enable" checked in the Secondary UDP Server section of WSJT-X - that's only for external logging programs.

I had this exact problem last month! The issue was Windows Defender blocking the UDP broadcast. Add both N1MM+ and WSJT-X to your firewall exceptions, and make sure no antivirus is interfering. Don't check Enable in Secondary UDP Server when WSJT-X runs from inside N1MM+.

Consider using separate INI files for contest operation vs daily WSJT-X use. N1MM+ creates "WSJT-X – ForEW1" instance that's completely separate from your everyday copy. This isolates your contest configuration and prevents conflicts with your regular digital mode setup.