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Security Gateway in HTTP/HTTPS Proxy mode sends TCP RST packet in response to TCP SYN packet
Symptoms
  • Security Gateway in HTTP/HTTPS Proxy mode sends TCP RST packet in response to TCP SYN packet.

    Example of TCPdump traffic capture:
    12:05:19.833686 IP IP_of_Client.62628 > IP_of_Proxy_GW.8080: S 1881248280:1881248280(0) win 8192
    12:05:19.834011 IP IP_of_Proxy_GW.8080 > IP_of_Client.62628: R 0:0(0) ack 1881248281 win 0
    12:05:19.834019 IP IP_of_Proxy_GW.8080 > IP_of_Client.62628: R 0:0(0) ack 1 win 0
    
Cause

1. Web browser on the client sends the HTTP/HTTPS traffic to the interface of the Security Gateway, whose "Topology" is defined as "External" in Security Gateway object.

2. Choosing an Interface as a proxy that is not the interface connected to the clients.


Solution
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