Xfinity connection/login

I have the Comcast version of Norton 360 [Norton Security Suite] and my problem may have nothing to do with Norton.

I tried to connect with an Xfinity "hotspot" and could not log in.  I had no trouble making the actual connection, but when I run my browser, there is no login page.  I have tried with both Firefox and IE - neither puts up a login page.

Since both browsers behaved the same, I wondered if there is a setting in Norton that I need to attend to that may be blocking a web page from loading from an "unsecured network".  I have called Comcast, and talked with 3 different "assistants" and could not get them to understand this simple problem.  They kept telling me to open my browser and enter my online name and Pword.

Are there any ideas?

Thanx

dc