Error 521: Using cloudflare

Hi,

I am running hestiaCP using cloudflare.

And now receive the error code 521.

Can someone suggest me, what causes this?

Until yesterday, everything worked out, and I haven’t done any changes to the hestiaCP/ server setup,
just installed few plugins on wordpress.

Thanks

Ok, I was able to resolve the issue.

And this is strange:

In my hestiaCP panel (logged in as admin, under server settings), nginx was turned off.

Just had to start it again.

I cannot remember to ever have turned it off at anytime.