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"500 server not found" error on Windows 8.1 when accesssing my website (works with Mozilla on Windows 7 and with IE on 8.1)

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New Surface Pro 3 running windows 8.1 (works with Windows 7). Firefox 34.0.5 is browser. Cannot access my website only. Have cleared cache. Works with Internet Explorer.

New Surface Pro 3 running windows 8.1 (works with Windows 7). Firefox 34.0.5 is browser. Cannot access my website only. Have cleared cache. Works with Internet Explorer.

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This error 500 is a error in your servidor probably an error with permissions of your folders. Try contact the owns of the servidor.

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Thank you. Since the website can be accessed by other browsers (Internet Explorer), I believe the problem likely is in Mozilla's configuration settings--I just don't know how to fix them!