I've been getting this too, since last night, trying to watch Contour via browser. The full message is:
"Please clear your browser's cache
Sorry, we're having some trouble. Please clear your browser's cache and then refresh this page. Learn how to clear your cache by clicking here.
Except clearing my cache, including cookies and everything else, does no good: I keep getting that error. And I get it with three different browsers: FF, ME, and Chrome. So I'm pretty sure if doesn't actually have anything to do with my cache. I've also tried rebooting my computer and modem, just in case, and that also made no difference.
Right now in Chrome, though, I can see the login box on watchtv.cox.com, but when I enter my credentials and click the sign in button I get this:
Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.
Sat Aug 25 14:49:11 UTC 2018
There was an unexpected error (type=Unauthorized, status=401).
Hi Imno007, disable any adblocker browser extensions, make sure third-party cookies are enabled within your browser settings, and ensure that your Flash player is up-to-date. Then try loading watchtv.cox.com again. It's working for me on Chrome this morning. -Becky, Cox Support Forums Moderator
Done all those things, nothing has changed. I've even added the address and set to allow under the Flash settings in Chrome. In Edge I don't have any addon's at all because I rarely use it, still doesn't work. I'll just wait it out, I guess. This happened one day last week and resolved after a while. Thanks
Okay, it seems to have something to do with my IP address. I had previously run ipconfig /release /flushdns /renew without it making any difference, but I've found that after actually changing my IP address I can sign in to Contour. The only problem now, though, of course, is that I can't access most of the channels because I'm using a different IP address. But some are better than none, I guess.
Hi Imno007, now that you've successfully signed into watchtv.cox.com with a different IP address, change your PC settings to configure DHCP automatically. Then, release and renew your IP address again, open a new browser window, and try to sign into watchtv.cox.com. Does the error message return? -Becky, Cox Support Forums Moderator
Okay, finally figured it out: it was my DNS. Should have checked that first, I guess, but I had completely forgotten that I'd changed it - months ago. I was using Cloudflare: 188.8.131.52. If Cox isn't now blocking it for some reason, I can only assume it's due to a temporary outage. (Although I would think that would affect my internet in general, so maybe Cox Contour IS blocking it...?)
EDIT: No, just put the Cloudflare dns back and Contour is still working now, so apparently NOT being blocked - didn't really think it likely, but good to know. Anyway, I guess I know what to try first if it happens again....