Socket connection issu

customer server connection server shows that the connection is successful, but one of the functions reports an error socket_read (): unable to read from socket [10060]
the code is as follows

<?php
header("Content-Type: text/html; charset=gb2312");
    //socket
    $socket = socket_create(AF_INET,SOCK_STREAM,SOL_TCP);
    //
    if(socket_connect($socket,"192.168.1.4",6002) == false){
        echo "connect fail massege:".socket_strerror(socket_last_error());
    }else{
        $message = "ttt";
        $message = mb_convert_encoding($message,"GBK","UTF-8");
        //

        if(socket_write($socket,$message,strlen($message)) == false){
            echo "fail to write".socket_strerror(socket_last_error());

        }else{
            echo "client write success".PHP_EOL;
            //
            while($callback = socket_read($socket,102400)){
                //socket_getpeername($new_socket, $addr, $port);
                echo "server return message is:".PHP_EOL.$callback;
            }
             echo socket_strerror(socket_last_error());
        }
    }
    socket_close($socket);//

No reason found

Aug.27,2021

see if port 6002 is open to connect

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b36a7c-41070.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b36a7c-41070.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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