Host Not Configured to Serve Web Traffic

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Last night I got this page, and was reminded of similar problems on other web sites. One thing that has been consistent about whenever I see this page is being logged on for long periods of time. Last time I saw the page, logging off an logging back on did not help. But here's what did, twice in a row now, without doing anything else at all:

Two times in a row now, after getting these pages, quitting the browser and restarting it cleared it up. Anyone else try this yet? (without doing anything else?)

Right. I shouldn't happen at all. I was just curious if simply restarting browsers actually works consistently, without doing anything else, it might help the developers figure out what the cause is. Wouldn't be surprised if it isn't consistent, but worth finding out.

What could be causing this?

It's possibly temporary and related to work being carried out on the hosting site - but as I block much of the top half of the screen for distraction-related reasons, I don't see any of it.
Then again, I have seen similar weird rendering nonsense with other sites and although I hesitate to suggest it: "have you tried restarting your browser?"

It fixed itself after refreshing the page, but it happens 3-5 times a week for varying periods.

That appears to confirm it's related to an external site which is slow to respond or fails to respond, making a mess of the rendering for that frame.
Those failures could also be caused by minor, temporary network routing problems somewhere between your location and those external sites.
I can only suggest we wait and see if it eventually resolves itself.

Sorry; it's all guesswork I know but it's extremely difficult to be accurate with what's happening on a machine I can't lay hands on.

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Please, read the responses already posted...

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Well that does surprise me, that those posts should take so long to surface.
Oh well, no harm done.

You'll see now that it's an occasional mess-up so the browser's basic handling of CSS seems unlikely otherwise it would be a constant.
I suppose it's feasible that more CSS is being dragged off failing remote sites, because that badly-rendered display certainly looks like it's CSS-related.

The cookie issue is an interesting one, and it is definitely possible that Cloudflare is munging the site cookies somehow and letting the sessions expire. I'll look into this.

We've also had a string of legitimate server issues that were causing actual outages on a near-daily basis - all that appears to have settled down now, and the server(s) have been quite stable as of late. What could have been a stale browser cache issue before prolonging legitimate outages now appears to be a definite issue within cloudflare itself.

Still looking into it.