"Looks like the cause of this is commit fb473a7 ( ) included in v4.23.
Android and Windows clients connect to Linux and Windows dedicated servers without any problems. iOS clients refused to open connection to both Linux and Windows servers. We tried mobile internet with server in the cloud and local wi-fi network - no luck in both cases. No log messages on the server side, no application crashes on the client side. When we build our project with older version of the engine (4.22 and earlier) iOS connections work as expected."

Steps to Reproduce
  1. Create minimal C++ project with connection to dedicated server.
  2. Build iOS client and <any> server (we tried Linux and Windows).
  3. Run server, run iOS client and try to connect to server.

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Affects Versions4.23
Target Fix4.23.1
Fix Commit8511277
CreatedOct 11, 2019
ResolvedOct 11, 2019
UpdatedOct 14, 2019