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I will contact Network Solutions about this. I do not have a firewall/security plug in installed. I will let you know what happens.
Update: Got my hosting provider to fix the PayPal IPN being blocked issue. Now it is working fine.
Here is the page I am using this on. If you need it, email me and I can share log in details with you:
I followed everyone of those steps, and the debug log did show the line when i manually visited the PHP file, but still after a test, there is nothing posting from the PayPal transaction. IPN is turned on in PayPal, PDT is turned on, and auto-return is turned on.