Update main.js

main.js

@@ -194,6 +194,16 @@ function initWebServer(settings) {
 
 
     adapter.log.info('config port: ' + settings.port);
+    
+        adapter.getPort(settings.port, function (port) {
+            if (port != settings.port && !adapter.config.findNextPort) {
+                adapter.log.error('port ' + settings.port + ' already in use');
+                process.exit(1);
+            }
+            webServer.listen(port, settings.bind, function() {
+                adapter.log.info('Server listening on http' + (settings.secure ? 's' : '') + '://' + settings.bind + ':' + port);
+            });
+        });
 
 /*
     if (settings.port) {