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W5100 send RST after receive ACK in 3-way handshake

Hi All
I got problem with IP chipset W5100 in server mode.
Chipset is trying to connect to server, send SYN to server. Receive ACK and then send RST :frowning_face:

Chipset IP 10.1.3.102, Server IP 10.1.3.104:

Connection is establish due to TCP retranssmition but RST shouldn’t be send.
Please advice.

Hi All
I fixed problem.
Source port was the same for all outgoing connection.
I changed it to random and problem disappeared.

Brzozoa

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