Had an issue yesterday where installing Microsoft CRM couldn't find the reporting server.
The error was a 404, essentially, the CRM install couldn't see the Reporting server.
The issue was that we had copy-pasted the Reporting Services web site
instead of the Reporting Services web service
In conclusion: don't do that.
"The best way to find yourself is to lose yourself in the [web] service of others." -Mahatma Gandhi [and this blogger]