socket connection between c server and PHP client - php

I trying to establish a socket communication from PHP client to C target, But I am always getting warning error as below:
Warning: socket_connect(): unable to connect [10061]: No connection could be made because the target machine actively refused it.
Note:
I am already tried the links:
http://www.pmoghadam.com/homepage/HTML/c-php-unix-domain-socket.html
socket_connect(): unable to connect [10061] - target machine actively refused it

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Is it possible that you do not have the ip address of the server hosting your php application whitelisted under your rds security group? Something like this: https://stackoverflow.com/a/21498471/6763406

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