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I have connected a Client ECU to my Server. I am trying to establish is a 3 way handshake. When I simulate my configuration the client ECU sends me the first message of 3 way handshake (SYN) message. 

Client address: 00:18:23:11:00:00
Server address: 10:E7:C6:0C:45:1C

Source Port= 49152
Destination Port: 443

Client [Source]= fe80::218:23ff:fe11:0
Server [Destination]=fe80::3c7b:72ca:2e98:d5ba

I am not able to respond to the client with a SYN ACK. I am not sure what could be the issue. what are the possible solutions ? All the data is captured by me on wireshark on port443. I am not able to upload any file as of now.

Client address: 00:18:23:11:00:00
Server address: 10:E7:C6:0C:45:1C

Source Port (Client)= 49152
Destination Port (Server): 443

Client [Source]= fe80::218:23ff:fe11:0
Server [Destination]=fe80::3c7b:72ca:2e98:d5ba

I am not able to respond to the client with a SYN ACK. I am not sure what could be the issue. what are the possible solutions ? All the data is captured by me on wireshark on port443. I am not able to upload any file as of now. now.

I have connected a Client ECU to my Server. I am trying to establish is a 3 way handshake. When I simulate my configuration the client ECU sends me the first message of 3 way handshake (SYN) message.

Client address: 00:18:23:11:00:00
00:18:23:11:xx:xx
Server address: 10:E7:C6:0C:45:1C
10:E7:C6:0C:xx:xx

Source Port (Client)= 49152
Destination Port (Server): 443

Client [Source]= fe80::218:23ff:fe11:0
fe80::xxx:xxxx:fe11:0
Server [Destination]=fe80::3c7b:72ca:2e98:d5ba
[Destination]=fe80::3c7b:72ca:xxxx:xxxx

I am not able to respond to the client with a SYN ACK. I am not sure what could be the issue. what are the possible solutions ? All the data is captured by me on wireshark on port443. I am not able to upload any file as of now.