The WSA sends the SYN, but instead, uses the client's IP as the source.When the packet comes back, it goes directly to the WSA. The WSA sends a SYN to the web server using its own IP address as the source.If explicitly proxying through the WSA or the telnet test is successful, this shows that the WSA can communicate directly to the web server, but when a client proxies through the WSA with IP spoofing, there is a problem. IP Spoofing enable, but not properly configured It is recommended that the firewall logs and/or packet captures from the firewall are analyzed for further details. If the ping is successful, but the telnet fails, there is a good possibility that a filtering device, such as a firewall, is preventing this traffic from getting through the network. See the instructions further in this article for performing a telnet test. If the ping succeeds, then we can know for sure that the WSA has a basic layer3 level of connectivity to the web server.Ī telnet test will verify if the WSA has the ability to establish a TCP connection on port 80 to the web server. It may mean that ICMP packets are getting blocked somewhere in the path. WSA> ping If the ping fails, it does not mean that the server is down. This can be done by using the following CLI command: ![]() The first step is to verify if the WSA can ICMP ping the web server. IP spoofing is enabled on the WSA, but is not properly configured (no return path redirection) A firewall or similar device is dropping either the WSA SYN packets or the web server's SYN/ACKĤ. A network issue on the WSA network is preventing the SYN packets from getting to the Internet.ģ. The web server or web server network is having issues.Ģ. If the web server does not respond to the WSA's SYN packets, after a certain amount of attempts, the client will be sent a 502 Gateway Timeout error.ġ.
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