Today, I was working on integrating a web application with Paypal. My IPN handler in my development environment could not be reached by Paypal, although my test web server was published to the Internet.
Having searched for simple ways to test a Url from the Internet, I have found the following which I recommend: http://www.changedetect.com/cd-test-url.asp
[Updated on 22 Oct 2006]
Endeavouring to compare web hosting packages, I have used:
[Updated on 25 Oct 2006]
An excellent and still free web site monitoring service is available at:
[Updated on 6 Nov 2006]]
A comprehensive DNS toolset can be found at: