HTML Access "Missing route token in request" error in broswer

Hi

I am preparing a new View 5.3 environment and installed the HTML Access addon on the connection server.  I have made sure that it is enabled for the connection server and the pool, and also installed the Remote Experience Agent in the virtual desktop.

However when I go to the url https://hostname:8443 I just get: 'Missing route token in request' in Firefox or Chrome, and a 404 in IE.  I have tried the usual things such as rebooting and restarting services to no avail.

Does anybody have an idea of where things went wrong?

Thanks

Matt