Question

I need to use websockets for implementing a bi-directional communication between my silverlight client and the server. I could connect/disconnect to/from the server and both OnOpen & OnClose events in both of client and server fired well, but i have a problem with sending messages to the server :
when I send a message to the server, I don’t get any error at the client side where as the OnMessage operation of my service at the server never called(the message sent from client without any problem but server never receive that!).
You can get my sample code here.
Thanks

Answer 1

“One additional restriction on using
the sockets classes is that the
destination port range that a network
application is allowed to connect to
must be within the range of 4502-4534.
These are the only destination ports
allowed by a connection from a
Silverlight application using
sockets.”

Source:
http://msdn.microsoft.com/en-us/library/cc645032%28v=VS.95%29.aspx

Having a policy file will only make it
work with the mentioned port range.
Without a policy file it will not work
at all. These two (and many more)
restrictions do not apply to trusted
applications.

http://social.msdn.microsoft.com/Forums/en/silverlightdeveloper/thread/b4f7120d-71d9-4132-9c31-b456803cd32f

---

Update

try to change your policy file to this:

<access-policy>
<cross-domain-access>
<policy>
  <allow-from http-request-headers="*">
    <domain uri="*" />
  </allow-from>
  <grant-to>
    <socket-resource port="4502-4534" protocol="tcp" />
  </grant-to>
</policy>
</cross-domain-access>
</access-policy>