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Remote Source Port Filtering
Client requests to local servers usually use an unprivileged port between 1024 and 65535
Server responses usually originate from the source port assigned to the particular service
The source port in incoming packets identifies the program on the remote host that is sending the message.
Incoming requests and connections from remote clients to your local servers will have a source port in the unprivileged range. If you are hosting a web server, all incoming connections to your web server should have a source port between 1024 and 65535.
Incoming responses and connections from remote servers that you contacted will have the source port that is assigned to the particular service. If you connect to a remote web site, all incoming messages from the remote server will have the source port set to 80, the http service port number.