I had no problem with http://www.mymedicare.com/

Please explain the problem in detail. What happens? Error messages?

FIREFOX INDICATES "UNABLE TO CONNECT"- TO BUSY,WRONG ADDRESS- TRY AGAIN. I GAVE UP AFTER SEVERAL TRIES. ALSO, I VERIFIED FIREFOX HAS ACCESS TO THE INTERNET AND REMOVED COOKIES. I CLEARED DNS CACHE AS WELL. I DO NOT HAVE A PROBLEM WITH OTHER WEB SITES.

Why do you want to access that site? The domain is registered anonymously through a service in Australia. Perhaps your security software or ISP considers it suspicious?

The actual U.S. government site is not on a .com domain, it's on a .gov domain:

https://www.mymedicare.gov/

It's probably safest to start with the agency's main site here and use the link to the login page:

https://www.medicare.gov/

MY QUESTION SHOULD HAVE BEEN www.mymedicare.gov- IT WAS A TYPO ON MY PART. I HAVE GONE TO MEDICARE.`S WEB TO LOG WITH SAME RESULT.

I can't think of any good reason the site would be blocked.

Could you try running some malware cleaners in case your computer has an infection? This article lists programs other Firefox users have found helpful. They are all free or free for 14-30 days, no credit card required. If you get any messages indicating you have to pay for cleaning, that could indicate a "fake antivirus" infection.

Troubleshoot Firefox issues caused by malware

Are you trying to connect via your computer or cel?

I`m using my laptop which has the problem. I can access my medicare when using the cell.

Start Firefox in Safe Mode {web link} by holding down the <Shift> (Mac=Options) key, and then starting Firefox.

A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?

Start your Computer in safe mode with network support. Then start Firefox. Try Safe websites. Is the problem still there?

http://encyclopedia2.thefreedictionary.com/Linux+Safe+Mode Starting Any Computer In Safe Mode; Free Online Encyclopedia