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Issue Varnish installation Can not start container

straddi

Basic Pleskian
Server operating system version
Debian 11.7
Plesk version and microupdate number
Plesk Obsidian 18.0.52 Update #3
I installed docker and then varnish cache following this guide.


After the step:

That means that all HTTP requests that are sent to the 32780/tcp of the server would be redirected to the port 80/tcp of the Varnish Docker container. Even though we are not going to use the 32781 rule, it is necessary to set it up by design.
Click “Ok” to run the container.

I get the following error message: Error: Could not get socket :80: Permission denied (-? gives usage)

With the Varnish installatoin via Docker, all rights should actually be set. Where is the mistake?
 
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