https://github.com/WWBN/AVideo/issues/9167

plugin/YPTSocket/test.php

@@ -20,7 +20,22 @@
 $address = $socketobj->host;
 $port = $socketobj->port;
 $socketobj->forceNonSecure = false;
-
+
+if (!isPortOpen('127.0.0.1', $port)) {
+    _log("Port {$port} is not open on localhost");
+    die();
+}
+
+if (!isDomainResolving($address)) {
+    _log("Domain {$address} is not resolving");
+    die();
+}
+
+if (!isPortOpen($address, $port)) {
+    _log("Port {$port} is not open on {$address}");
+    die();
+}
+
 $url = "://localhost:{$port}";
 $SocketURL = 'ws' . $url;
 _test_send($SocketURL, 'ws');
@@ -45,6 +60,26 @@
     _test_send($SocketURL, 'wss');
 }
 
+function isPortOpen($host, $port) {
+    $output = [];
+    $result = null;
+    exec("nc -zv {$host} {$port} 2>&1", $output, $result);
+    foreach ($output as $line) {
+        _log($line);
+    }
+    return $result === 0;
+}
+
+function isDomainResolving($domain) {
+    $output = [];
+    $result = null;
+    exec("nslookup {$domain} 2>&1", $output, $result);
+    foreach ($output as $line) {
+        _log($line);
+    }
+    return $result === 0;
+}
+
 function _test_send($SocketURL, $msg) {
     global $SocketSendObj, $count;
     $_count = $count;
@@ -213,4 +248,4 @@ function printIfComplete() {
          */
         _log($msg);
     }
-}
+}