Lenovo Software Help Center

webRDP HTML 5 client and it starts to connect and then terminates

This is typically due to a network device like a load balancer or firewall that does not support webSockets.

webSockets ( ws:// ) is a protocol proving full-duplex communications over a single TCP connection.

It is used by Stoneware's webRDP HTML 5 RDP client.  More detailed information on this protocol can be found here : 
http://en.wikipedia.org/wiki/WebSocket

Because of the way this works if you are using a load balancer or a tightly locked firewall then your device needs to support this feature because the first handshake is a HTTP packet and after that is a TCP packets.  Devices that do not support this protocol end up dropping the connection after the handshake.

Browsers that do not support websockets (IE9 for example) will fall back to “long polling” method

Some other urls that explain webSockets and long-polling.

http://en.wikipedia.org/wiki/Push_technology

http://dsheiko.com/weblog/websockets-vs-sse-vs-long-polling
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