Google is your friend: Be nice and visit him often. He can answer questions a lot more quickly than posting them here...
A very quick search
using your subject as the search term gave nearly 2.5 million hits:
Google[
^]
The top hit solves your problem:
"The test form is only available for requests from the local machine"[
^]
In future, please try to do at least basic research yourself, and not waste your time or ours.