diff --git a/docs/config/01-configuration-file.md b/docs/config/01-configuration-file.md
index 12ad16e21..ca24a1cdf 100644
--- a/docs/config/01-configuration-file.md
+++ b/docs/config/01-configuration-file.md
@@ -227,6 +227,14 @@ If `true`, it captures browsers, runs tests and exits with `0` exit code (if all
 `1` exit code (if any test failed).
 
 
+## transports
+**Type:** Array
+
+**Default:** `['websocket', 'flashsocket', 'xhr-polling', 'jsonp-polling']`
+
+**Description:** An array of allowed transport methods between the server and the client. This is configuration of [socket.io](https://github.com/LearnBoost/Socket.IO/wiki/Configuring-Socket.IO).
+
+
 ## urlRoot
 **Type:** String
 
diff --git a/lib/config.js b/lib/config.js
index 377acf7f1..d0c0f5fce 100644
--- a/lib/config.js
+++ b/lib/config.js
@@ -258,6 +258,7 @@ var parseConfig = function(configFilePath, cliOptions) {
       dir: 'coverage/'
     },
     loggers: [ constant.CONSOLE_APPENDER ],
+    transports: [ 'websocket', 'flashsocket', 'xhr-polling', 'jsonp-polling' ],
     plugins: [ 'karma-*' ]
   };
   var dsl = new KarmaDsl(config);
diff --git a/lib/server.js b/lib/server.js
index 6470971fd..6373f0a3a 100644
--- a/lib/server.js
+++ b/lib/server.js
@@ -40,7 +40,7 @@ var start = function(injector, config, launcher, globalEmitter, preprocess, file
   var socketServer = io.listen(webServer, {
     logger: logger.create('socket.io', constant.LOG_ERROR),
     resource: config.urlRoot + 'socket.io',
-    transports: ['websocket', 'flashsocket', 'xhr-polling', 'jsonp-polling']
+    transports: config.transports
   });
 
   webServer.updateFilesPromise(filesPromise);