How come the connection to VM failed?

Hi,

I've already set up the Horizon View lab. But when I was about to connect to VM via View Client, a error message showed up.

pls check the attached snapshots. It seems View Client connected to server, but failed fetch the sources in broker. And mean while, the servers presented a healthy state in View Administrator.

Step:

1. launch View Client, and input connection server IP address.

2. A box pops up which want you to make sure the server can be trusted. Then click "Continue".

3. input credentials and then click login button

4. error shows up: "Error: Invalid server URL"

what happened there? I've worked all this day, still can't figure it out. Pls help...