Greeeeeetings fellow Xerox Printees!
I'm on the 'ol Workforce 7428. I cannot get my little buddy to serve up the CWIS properly. I've dug through the documentation... HTTP is turned on, port is good, its set to online...
I even gave the IP address a host entry! I have admin rights.
Assuming you are not going with a broken link from your bookmarks/favorites that is referencing a page that doesn't exist, or an https link while it is currently on http. And that you have tried another browser or at least deleting your cache/cookiesi. (Xerox devices hate Chrome)
Then I would try disabling HTTPs at the device then try fresh from the browser (but not Chrome)
To do this go to Machine Status > Tools > System Settings > Connectivity and Network Setup > Security and disable Https.