I have IE9 and could not access the site either.
I followed Mac9990´s advice and bingo, it works fine
I did click all of the TLS options
I unchecked the TLS 1.2 box and the site is immediately NOT accessible. The following information is then available under "More Information"
•Internet connectivity has been lost.
•The website is temporarily unavailable.
•The Domain Name Server (DNS) is not reachable.
•The Domain Name Server (DNS) does not have a listing for the website's domain.
•There might be a typing error in the address.
•If this is an HTTPS (secure) address, click Tools, click Internet Options, click Advanced, and check to be sure the SSL and TLS protocols are enabled under the security section.
Now My-Vacationclub.com IS a secure site since it is where owners log in. So this is why I check the TLS 1.2 box as recommended above.