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Not seeing an HTTP response to an HTTP GET

asked 2020-02-07 13:29:35 +0000

updated 2020-02-07 20:57:11 +0000

Guy Harris gravatar image

I have made a TCP three way handshake connection between FPGA board and PC, Then i have send a HTTP GET message from FPGA board to PC but i did'nt get HTTP reponse message from pc?

i hvae attached the Capture file through below this link.

The above file will be in .txt formatt so you open with in wire shark you can able to see capture Packets.

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Note, changing the extension on a pcap file to .txt doesn't make it a text file. Simpler just to leave the extension alone, Google Drive is quite happy with pcap files.

grahamb gravatar imagegrahamb ( 2020-02-07 13:44:54 +0000 )edit

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answered 2020-02-07 13:43:26 +0000

grahamb gravatar image

The machine at (server) closed the connection immediately after it was opened with a FIN. Then (client) sent the HTTP GET, but the server, having said that it was closing the connection with the FIN, sends a RST.

Presumably you do have an HTTP server application listening on port 80 on the server?

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Hi, I have now send the HTTP GET message at once the connection is established.Why still the response from the server is [RST,ACK]? Kindly share your knowledge.I have attached the Capture file through the link below. Thanks in advance

link text

kalainan gravatar imagekalainan ( 2020-02-10 11:35:00 +0000 )edit

Because something on the server caused the RST to be sent. Are you running an HTTP Server listening on port 80 on the server to service the request? Have you opened any necessary firewalls to allow it to communicate?

grahamb gravatar imagegrahamb ( 2020-02-10 12:43:00 +0000 )edit

No, its not a HTTP server and didn't open firewall for its communication.

kalainan gravatar imagekalainan ( 2020-02-10 12:49:12 +0000 )edit

Presumably something is running to accept the TCP connection, whatever that is will have to respond to the HTTP GET appropriately.

grahamb gravatar imagegrahamb ( 2020-02-10 13:27:00 +0000 )edit

Can you suggest what will be the reason for it..

kalainan gravatar imagekalainan ( 2020-02-10 13:45:42 +0000 )edit

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Asked: 2020-02-07 13:29:35 +0000

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Last updated: Feb 07