If you can identify the IP address of the actual streaming server (it probably isn't 'tvriver.com', or the login server) you run 'tracert' from a Windows command prompt. Be aware that figuring out which, of a myriad of IP connections, is the streaming server isn't easy.
In order to rule out local connection issues, follow ILpt4U
's suggestion. It will be quicker and easier; and, if it points to a fixable problem, you won't have to figure out a trace route target.