If you have trouble reaching my Checker Maven site (I've had several reports), clear your browser cache. Then it should work. But if not make sure you are NOT trying to access "https". You have to access "http".
There was a problem earlier in the week when my server host installed a security certificate to "do me a favor" that I didn't ask for, and it caused all sorts of grief, forcing "https" to be propagated to DNS servers worldwide, and it takes a long time to get changed back to "http".
My apologies if you've had difficulty reaching the site.