How to run Docker?

1. I run my ASP.NET gRPC server with ports http://localhost:54320; https://localhost:54321

1.1. Then I run the grpcui.exe
PS D:\_Docker> grpcui localhost:54321
gRPC Web UI available at http://127.0.0.1:56677/
PS D:\_Docker>
and it works fine: I see my browser page.

2. Now I want to use docker:
2.1. docker pull fullstorydev/grpcui
2.2 docker run -it --rm -p 0.0.0.0:8180:8080 fullstorydev/grpcui:latest localhost:54321
Failed to dial target host "localhost:54321": dial tcp 127.0.0.1:54321: connect: connection refused

How to fix it and run grpcui in docker?

What is the command line to run the docker? parameters? IMHO they should be described .