I created and tested a Java EE 7 application that uses WebSockets on my local PC. All works fine when I deploy to WildFly 8 on my local machine, and access the application using localhost.

When I deploy the same application on a cloud server, (Ubuntu 14.04) with exactly the same WildFly configuration, I get the following message when the application tries to connect:

"NetworkError: 404 Not Found - http://178.xx.xx.xx:8080/pss/ws/notification"
Firefox can't establish a connection to the server at ws://178.xx.xx.xx:8080/pss/ws/notification.

I can access the application, it is just the websocket connection that fails.

pss is my context root, and the websocket end point is annotated with @ServerEndpoint(“/ws/notification”), so the URL is correct and works 100% on my local machine using localhost.

When I deploy the application I can see that the websocket endpoint has been picked up by WildFly, so this is not the issue

2015-02-14 14:18:21,200 INFO  [io.undertow.websockets.jsr] (MSC service thread 1-2) UT026003: Adding annotated server endpoint class za.co.ssms.interfaces.websocket.NotificationWebSocket for path /ws/notification

The request headers are correct:

Accept  text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Encoding gzip, deflate
Accept-Language en-US,en;q=0.5
Cache-Control   no-cache
Connection  keep-alive, Upgrade
Cookie  JSESSIONID=mgFhI1MAZwT2NwULXDXgEaXt.app
Host    178.xx.xx.xx:8080
Origin  http://178.xx.xx.xx:8080
Pragma  no-cache
Sec-WebSocket-Key   LD55xYAKjJoXgLXQpUS7fA==
Sec-WebSocket-Version   13
Upgrade websocket
User-Agent  Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:35.0) Gecko/20100101 Firefox/35.0

I am accessing the application using the following URL (IP modified), and the ports match:

http://178.xx.xx.xx:8080/pss/

If I run netstat -an | grep ‘LISTEN’ on my cloud server I get the following, which shows that 0.0.0.0:8080 is bound and listening:

tcp        0      0 127.0.0.1:9990          0.0.0.0:*               LISTEN     
tcp        0      0 0.0.0.0:3528            0.0.0.0:*               LISTEN     
tcp        0      0 127.0.0.1:3306          0.0.0.0:*               LISTEN     
tcp        0      0 0.0.0.0:8080            0.0.0.0:*               LISTEN     
tcp        0      0 0.0.0.0:8787            0.0.0.0:*               LISTEN     
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN     
tcp6       0      0 :::22                   :::*                    LISTEN     
unix  2      [ ACC ]     STREAM     LISTENING     9227     /var/run/acpid.socket
unix  2      [ ACC ]     STREAM     LISTENING     7014     @/com/ubuntu/upstart
unix  2      [ ACC ]     STREAM     LISTENING     8907     /var/run/dbus/system_bus_socket
unix  2      [ ACC ]     STREAM     LISTENING     9448     /var/run/mysqld/mysqld.sock
unix  2      [ ACC ]     SEQPACKET  LISTENING     7666     /run/udev/control

Apache is not installed so this is a direct connection to WildFly server.

After several days I am pretty stumped as to why this is failing.

Somewhere in the chain the HTTP upgrade requests that are failing, and I can not pin point where.

Thanks in advance