The calls to JoinMulticastGroup and LeaveMulticastGroup on FSocket do not allow for the interface address to be passed in, only the the group address. The interface address is currently hard-coded to INADDR_ANY, which may not select the correct interface in a multiple adapter setup.

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There's no existing public thread on this issue, so head over toAnswerHub just mention UE-60860 in the post.

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Affects Versions4.19
CreatedJun 20, 2018
UpdatedJun 25, 2018