Disconnecting on subscribing/publishing

I set up a websockets server locally running via wss and I can connect to it successfully:

websocket.on("socket/connect", function(session){
        console.log('connected');
}

works as expected.

However, once I try

session.subscribe("chat", function(uri, payload){
    console.log("Received message", payload.msg);
 });

I am immediately disconnected. In Firefox the message is "Disconnected: Connection lost - scheduled 1th reconnect to occur in 5 second(s). With code 6"

From the server side the log display as follows:

17:36:15 DEBUG     [websocket] INSERT CLIENT 897 ["user" => "s:36:"anon-8148039825a8aeeef50fab594866255";"] []
17:36:15 INFO      [websocket] anon-8148039825a8aeeef50fab594866255 connected ["connection_id" => 897,"session_id" => "8148039825a8aeeef50fab594866255","storage_id" => 897] []
17:36:15 DEBUG     [websocket] GET CLIENT 897 [] []
17:36:15 INFO      [websocket] anon-8148039825a8aeeef50fab594866255 subscribe to chat [] []
17:36:20 DEBUG     [websocket] INSERT CLIENT 894 ["user" => "s:37:"anon-12065318285a8aeeea4b641205203743";"] []

I added the respective topic with a name "chat" and registered it as a service with the correct tag.

Is there something I am missing here? Could it be that this problem is related to usage via SSL?

GeniusesOfSymfony / WebsocketAppDemo

Disconnecting on subscribing/publishing #10