Hello! I recommend you try downloading everything you have from html, css and js files, and with an advanced text editor you look for those numbers, it is usually a plugin or something that is trying to communicate with that "website" but since it does not exist maintains the Connecting ..
Like what he said, I will add up, notepad++ is the best

you can open all with no heavy memory load and search in all files..
I would download all site, put all in one folder, search for
., cut all files and put in one new folder, keep js, html (I doubt css will try to connect though, but you can include), select all and open in notepad++, search number, find the file and track it back to which plugin or fix whats broken (advanced)