docker run is stalling - asp.net

Question

I'm trying to run a docker image, which is essentially the default ASP.Net 6 default API:
docker run my-image-name --restart=aways -d -p 80:5111
I've tried a few different ways of running this, but it appears to always do the same thing. First of all, whether I launch in detached mode or interactive, I get the following display:
{"EventId":14,"LogLevel":"Information","Category":"Microsoft.Hosting.Lifetime","Message":"Now listening on: http://[::]:80","State":{"Message":"Now listening on: http://[::]:80","address":"http://[::]:80","{OriginalFormat}":"Now listening on: {address}"}}
{"EventId":0,"LogLevel":"Information","Category":"Microsoft.Hosting.Lifetime","Message":"Application started. Press Ctrl\u002BC to shut down.","State":{"Message":"Application started. Press Ctrl\u002BC to shut down.","{OriginalFormat}":"Application started. Press Ctrl\u002BC to shut down."}}
{"EventId":0,"LogLevel":"Information","Category":"Microsoft.Hosting.Lifetime","Message":"Hosting environment: Production","State":{"Message":"Hosting environment: Production","envName":"Production","{OriginalFormat}":"Hosting environment: {envName}"}}
{"EventId":0,"LogLevel":"Information","Category":"Microsoft.Hosting.Lifetime","Message":"Content root path: /app","State":{"Message":"Content root path: /app","contentRoot":"/app","{OriginalFormat}":"Content root path: {contentRoot}"}}
It then seems to stall - I can't ctrl-c, nor can I attach to the process (it does show under docker ps). I also can't connect to the API:
http://localhost:5111/swagger
Just returns ERR_CONNECTION_REFUSED
My guess here is that there's something wrong with the dockerfile itself - however, it builds fine. The question I have is: how can I debug this in order to determine the error?

Answer 1

I can't add this as a comment because i don't have the reputation so it will have to be an answer instead.
I am new to Docker myself so I am not sure why it is stalling but when you specify the port with -p 80:5111 you are mapping port 5111 in the container to port 80 on the Docker host.
So you should connect with http://localhost:80/swagger instead.