[Bug]: Running a server for a few friends, one specific person unable to connect

[defectivecyborg]

Possible Fixes

Yes

Modpack Version

2.13

What happened?

I'm running a server for some friends, and one friend is consistently unable to join. She gets the same error message every time: "connection refused: getsockopt". I previously ran the server on the 1.20 version of the pack and we encountered the same issue. She was able to connect once after I whitelisted her username, but when she disconnected and tried to rejoin she got the same error. This happened again in the same fashion when I updated the server to 2.13. We've tried messing with firewall settings on both the host and client computers up to and including straight up disabling it. I've tried a lot of different fixes for the error I've found online with no luck.

latest.log

No response

Developer reports

No response