PayPal IPN Sandbox

If I enter http://www.rewardsandmore.compaypal/ipn_sandbox.aspx for the IPN Handler URL, I get the error:

"IPN delivery failed. Unable to connect to the specified URL. Please verify the URL and try again."

If I use just the domain name for the IP Handler URL, then I don't get an error message.  

I'm confused.  Can someone explain this?
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here is the answer

compare this with your script -  - choose ur language and proceed to get the right IPN Script

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