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Question by Elitebros · Sep 06, 2021 at 07:21 AM · exception socket tcp

System.NotSupportedException: This protocol version is not supported

when use TcpClient connect function, this exception happen. My code work on wifi , 4g , and ios 5g, but some android device which is on 5g signal get this exception, any one can help me? I try use new TcpClient(AddressFamily.InterNetwork), not get exception but can not connect to server.

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