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There are 4 types of indicators: green, red, orange and gray.
1) green: the tested parameter is ok (e.g port is connectible).
2) red: something is bad (e.g. downloading is broken).
3) orange: the test is running now.
4) gray: the test has not been executed yet.

Screenshot:

It will be soon, but here is the first version of the tool (it is inconsistent a bit with the description above):