Unable to bind to http://localhost:5000 on the IPv6 loopback interface: ‘Cannot assign requested address’

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To workaround the issue, add the code ENV ASPNETCORE_URLS=http://+:80 below the other ENV declarations at the top of the Dockerfile.develop file

Dockerfile.develop after:

FROM mcr.microsoft.com/dotnet/core/sdk:3.1
ARG BUILD_CONFIGURATION=Debug
ENV ASPNETCORE_ENVIRONMENT=Development
ENV DOTNET_USE_POLLING_FILE_WATCHER=true  
ENV ASPNETCORE_URLS=http://+:80  
EXPOSE 80

Explanation

Server URLs is one of the ASP.NET Core Web Host configuration values. It uses the environment variable ASPNETCORE_URLS and defaults to http://localhost:5000:

Indicates the IP addresses or host addresses with ports and protocols that the server should listen on for requests.

Key: urls
Type: string
Default: http://localhost:5000
Set using: UseUrls
Environment variable: ASPNETCORE_URLS

See another thread for the meaning of http://+:80: What’s the difference between http://*:80 and http://+:80

Update

As @Monsignor has pointed out:

The original issue is caused by an attempt to bind to localhost which AFAIK is not allowed from inside a docker container. But it’s perfectly fine to bind to 0.0.0.0, for example.

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)