Firewall blocking just one website

I have a new computer with Windows 7. I installed Norton Internet Security and it installed fine.

 

I am having a problem with the Firewall blocking just one website. I am getting the message from the website:

The Web Application Firewall has denied your transaction due to a violation of policy.

You may want to clear the cookies in your browser.

 

I tried to adjust the Firewall settings but could not seem to fix the problem.

 

Can anyone help me?

 

Thanks,

Lawrence