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Varnish for WordPress in a Docker container in Plesk Onyx

Does anyone else have the problem that they can't login to WordPress? The website works, HTTPS works, but when accessing /wp-admin/, I get redirect loops

Correction, that seems fixed. However, now I get Mixed Content Warnings when accessing the admin pages. Apparently the WordPress Admin Stylesheets are only loaded via http, not https, any ideas?
 
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There is one thing this tutorial doesn't explain.

"Firewall / Plesk Firewall."

This is the reason many of you getting "Error 503 Backend fetch failed" error.

In your Firewall / Plesk Firewall, Open incoming to Port 7080 from any host.
 
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Thank you very much for the trick, it solved my 503 problem immediately!

Please insert that detail in the guide!

Thank you very much!
There is one thing this tutorial doesn't explain.

"Firewall / Plesk Firewall."

This is the reason many of you getting "Error 503 Backend fetch failed" error.

In your Firewall / Plesk Firewall, Open incoming to Port 7080 from any host.
 
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