facebook connect fails on IE9 when a port is used

My facebook Webs开发者_JS百科ite app is configured for a site url using a port number

ie www.example.com:900

Fconnect functionality works in Firefox (all versions) however ie9 gives an error stating

"An error occurred with xxxAppname. Please try again later."

Any help is appreciated.

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Ensure that the URL for the app is exactly how it is shown in the browser.

Http://www.example.com is different to http://example.com

Also I don't think that you need to include your port number for it to work.