spring-boot-admin: Can't access spring boot admin ui via nginx

Hi,

I was using spring boot admin old version with spring boot 1.5.X and it worked great. I’ve upgrade my env to use spring boot 2.3.1 version and I can’t access spring boot admin ui.

My env consist of dockerized microservices, all running behind nginx server with only https access. I’m also using eureka server to fetch the micro-service’s data. i’m trying to access the SBA container in http mode. in the browser’s network I see a ‘Mixed-content’ warning and https://admin/assets/img/favicon.png net::ERR_NAME_NOT_RESOLVED when trying to access some local resource. an access to the main end point returns response of 200 but when trying to get .js and .css resources from /assets path it fails/

the configuration in nginx.conf:

   location /{
              proxy_pass  http://admin:9090/;
           }

when I opened in internal port to the SBA container, thus passing around the nginx, the SBA UI is working fine.

my SBA configuration has no security settings and uses the most basic config. also, I use spring boot 2.2.7 version with 2.2.4 spring boot admin version

SBA application properties:

eureka.client.register-with-eureka=false
eureka.client.fetch-registry=true
eureka.client.registry-fetch-interval-seconds=5
eureka.instance.lease-renewal-interval-in-seconds=10
eureka.client.serviceUrl.defaultZone=http://127.0.0.1:9000/eureka/
server.forward-headers-strategy=native

I have tried:

1. setting the spring boot admin ui to use only https
2. configuring nginx with X-Farward… params
3. setting spring.boot.admin.ui.public-url=http://admin:9090/
4. trying to set SBA: server.tomcat.remote-ip-header=x-forwarded-for server.tomcat.protocol-header=x-forwarded-proto

there are no errors in SBA logs. attached are the warning and errors that I see in Chrome

your help is very much appriciated.

Thank you in advance Alex