Download the Client Plug-in from the Project you are trying to connect to be sure your software version matches.
There is a Download Plug-in Here link at the WELCOME Page.
For example at the DEMO it is at:
If you cannot find the Download Link,
Replace demo.broadwin.com with the IP address of your project Node.
Does the deploy file exist in the broadweb folder of the Web server (Project Node)?
Security on the wwwroot subdirectory does not allow access