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Resolved Unable to login after upgrade to 17.5.3

Tigzy

Basic Pleskian
Hello,
After the upgrade impossible to login.
When I enter my creds, I see the UI for 1 second then it comes back to the login screen.
I have tried this: How to get or reset password for admin account in Plesk
The login URL does the same and comes back to login screen, so I'm stuck.

The server appears to be working normally, apps are running, emails are OK.
I've tried to repair everything with:
# plesk installer --select-release-current --reinstall-patch --upgrade-installed-components

And with the repair utility. No luck.
Any help?
 
Appears to be fixed after I switched off the Cloudflare caching.
This may help others.
 
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