无法获得php脚本来ping特定端口和IP

Question

I have been trying to ping a specific IP and port to check if it online or offline. If I set the port to 80, it works but any other port it says it not working. I am able to connect to the port via game, telnet, etc

//Connection Info
$ip = "*******"; //IP
$port = "2302"; //Port

//Connection
$sock = @fsockopen( $ip, $port, $num, $error, 2 ); //2 is the ping time, you can sub what you need

//Check Status

if( !$sock ){

//Closed
        echo( "It appears to be closed" );

}

if( $sock ){

//Open
        echo( "It appears to be open" );
        fclose($sock);

}

Here is the error I get

Warning: fsockopen() [function.fsockopen]: unable to connect to *******:2302 (No connection could be made because the target machine actively refused it. )

Answer 1

If I set the port to 80, it works but any other port it says it not working.

This makes it look pretty much like a firewall problem (either on the generating end or at the receiving end).

Are you sure the server where this code's running is allowing any communication at all except to a restricted range of ports? How about ports 25, 81, 110, 443 and 8080?