https://premium.wpmudev.org/wp-checkup/

Good day,

I just want to ask how can we fix this issue on using https://premium.wpmudev.org/wp-checkup/ , while using this tool and entering our site url I get this error "Your domain does not appear to be publicly accessible on the Internet (connect() timed out! - 28). We can only scan publicly accessible websites."

Hope you can help us..