Hyperlink doesn't work

[foxguy]

I have a hyperlink to "http://www.discovercard.com/" that doesn't work. When I click it I get an error saying "Unable to locate the server or proxy server". But when I cut & paste the address from the hyperlink into my browser (no chance of mistyping), it works fine.

[shg]

Works fine for me as =HYPERLINK("http://www.discovercard.com/")

[ncmay]

This works for me in Excel 2003:

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[foxguy]

Ok, I guess the problem must be with my browser somehow. I'm using Firefox, anybody else using Firefox and it works for you?

[teylyn]

No problems with XL 2007 nor XL 2010 and Firefox 3.5.7.

Can you open any Excel internet hyperlink at all? Are you behind a proxy server?

I get an error saying "Unable to locate the server or proxy server"

Which application delivers that error message? Excel or Firefox?

[foxguy]

I have 18 hyperlinks on the same sheet and all but the "Discover" one work fine. Been working for over 2 years. I'm pretty sure that my "Discover" link used to work, but doesn't now.
The error message box has "Microsoft Excel" as it's title, and no window opens in Firefox.

[teylyn]

you sure there's no typo in the URL?

[foxguy]

Positive there is no typo. I cut & paste from the hyperlink into my browser and it works fine.

[shg]

And that URL is ...?

[foxguy]

http://www.discovercard.com/

[shg]

Same as before. Still works fine for me as in post #2 in IE7.

[foxguy]

Found something that works.
I changed the hyperlink to "https://" from "http://" and now it works. Even though it's being redirected to http:// once it's in the browser, Excel can't find it.
Any explanation for why?