Varnish docker and nginx, plesk

详细信息

I'm facing an issue with Varnish running in a Docker container within a Plesk environment. The setup works perfectly on the staging server, where Varnish runs in front of Nginx, and performance is fast. However, after migrating to a new server with Plesk and an identical setup, Varnish refuses to start with the same configuration and parameters.
Detailed description is here at PLESK forum: https://talk.plesk.com/threads/issues-with-magento-2-varnish-ngin-x.377951/
It also holds detailed docker+varnish setup. The varnish and nginx and setup takes about 20 mins to do so thesolution is quick, but then it is stopping with the errors mentioned in the post
Ports: 80 for HTTP, SSL on 443
The issue: I understand the conflict of having the same ports on both services, but I'm trying to point Nginx to port 8080 as specified in the Varnish config file. When I do this, it doesn't work.
What I need:I'm looking for someone who has experience with Varnish in Plesk/Docker environments and can resolve this issue quickly. You should have a "hit the ground running" attitude and be able to solve this in 1-2 hours. This is not a multi-day or week-long project, just a quick fix for someone who knows how to address it.
Key Skills Needed:
1. Varnish configuration and troubleshooting
2. Docker and Plesk setup
3. Nginx configuration knowledge
Please apply if you're confident in your ability to resolve this issue quickly and efficiently.