Ok thanks will try that AlastairOK -
That would imply you've customised the HTTP port to 8080 from 80.
If not - the check will fail.
And it would also imply that the device coincidentally has the same IP address as @bashis used in an example.
If not - the check will fail.
Suggestion :
Re-try with the actual values of your device so that you get a real result.