Me and who I'm trying to play with both wiped our Nuclear Throne files, and reinstalled the mod. The connection timeout error is still happening. What can we do?
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DLL mismatch is the only known issue that causes persistent connection problems.
You could both try connecting to someone else to troubleshoot source of problem better.
Future versions of the mod will be doing a better job at ensuring that the DLL file is the right version and informing about the fact if it isn't.