Specific Https problem

I’m almost at my wits end here with a problem. I keep trying to get access to the following sight:
https://online.parker.com/pol/portal
It is an employee website. I’ve used it many times before with no problems, but for the last several days I keep getting error messages, such as:
"Access Denied" or "You are not authorized to view this page" or "HTTP Error 403 - Forbidden" or sometimes it asks for a "username and password" (which I supply it with), but it will just keep asking the same thing until it goes to a screen that says: "Login Required
You must login before you can access the resource you have requested.
Explanation
The resource you have requested is secured by Access Manager WebSEAL, and in order to access it, you must first login."

Other Https sites work without issue.

I have ran Norton antivirus an it found no issues. I have also ran Spybot S&D, and AdAware; but neither of them reported any problems.
I have tried logging on from 2 different computers at neighbors, and it works just fine, so I’m assuming it something in my systems.

I have WinXP Ser.2, Norton Firewall, and a linksys router. I have bypassed the router-and nothing. I have turned off Norton and nothing. Windows firewall is OFF. I have checked and rechecked my IE security options and they are as they have always been.

PLEASE help if you can. I ran HijackThis, but it’s all greek to me.

Any help would be most appreciated.

 

Try clearing your temporary internet files (cache). Once a page fails, this may cause continued error messages, even after the problem (at the page hosting site) is fixed.

 

I did that but it didn't help any. Even downloaded firefox browser and got the same result. I can still go to the neighbors house and pull it up, but can't get it on my computer at all any more.Very odd.

 

Does it give you the same results for the link below?

https://polprod.parker.com/portal/

 

THAT WORKS!!!! BUT WHY?? The online.parker.com still does not work, but your link did. I'm still way confused....thankfull.....but confused.

 

It appears that they have changed there website address. It says to update boomarks, favorites and links so from now on I would use the link below.

https://polprod.parker.com/portal/