Kestrel ListenAnyIP(8080) ignores ASPNETCORE_URLS (cannot bind loopback/custom port)

[tikicoder]

Bug

Program.cs always calls options.ListenAnyIP(8080), which overrides ASPNETCORE_URLS.

Container Apps / Docker already set ASPNETCORE_URLS=http://+:8080, but that value is ignored. Local orchestrators (e.g. spawning multiple Toolkit instances behind Bastion SOCKS) cannot bind http://127.0.0.1:<port> without changing code.

Expected

• When ASPNETCORE_URLS is unset: keep default 0.0.0.0:8080 (Container Apps parity).
• When ASPNETCORE_URLS is set: honor it (including loopback + custom port).

Related

• Local Bastion / SOCKS orchestration: Support SOCKS5 / Gateway mode for local MCP behind Azure Bastion #152 / feat: Gateway proxy for private Cosmos (SOCKS5 and HTTP CONNECT) #157
• No existing issue or PR found for this listen-bind behavior.