According to the UDN thread, a second listen server started on a machine will not process the travel URL correctly and fail to actually load a map in listen mode.

Steps to Reproduce

See UDN thread

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There's no existing public thread on this issue, so head over to AnswerHub just mention UE-66752 in the post.

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Affects Versions4.20.2
Target Fix4.23
Fix Commit9319005
Main Commit9874282
CreatedNov 19, 2018
ResolvedOct 28, 2019
UpdatedFeb 11, 2020