alan21
December 4, 2020, 5:11pm
1
I am getting an intermittent 521 Cloudflare page when accessing my azure app.
The cf 521 error page returns immediately.
If I bypass cloudflare, i.e. access the server directly via *.azurewebsites.net I get no error.
It just started happening after no changes to server.
If I reload the page, it immediately works again (so I’m pretty sure this is not an actual 521)
I don’t see any error in server logs
I am thinking it is related to a config problem, there is a single cloudflare proxy doing something bad. @stefano1
jjb
December 7, 2020, 6:54pm
2
Seeing the same thing here with one of our domains. Intermittant 521s that immediately go away with a refresh.
alan21
December 7, 2020, 8:05pm
3
If you’re using Azure, I think I managed to fix it by going into the Azure Tsl/Ssl settings and creating a binding that binds to the Cloudflare private cert. and enabling https on.
Hope this helps you.
edit: did not fix but it seems way more intermittent now - i’m just disabling cf proxy now.
Disabling cf proxy is the fix, haven’t seen error in 2 days.
system
December 11, 2020, 10:06pm
4
This topic was automatically closed 24 hours after the last reply. New replies are no longer allowed.
Hello Alan,
we might need to record that to a ticket, directly on your website, do you mind open a ticket and paste the number here,
@jjb could you also open a ticket?
the ideal here is to create a test sub-d, domain, proxied with CF, please check:https://support.cloudflare.com/hc/en-us/articles/203118044-Gathering-information-for-troubleshooting-sites
thanks!