slirp4netns works but pasta not

[kingwingfly]

podman --version
podman version 5.4.0

If I use slirp4netns:

podman run --name server -itd <...> --network slirp4netns -p 8081:8081 --replace server

Then curl success:

curl http://localhost:8081
{"ok":false,"error_code":404,"description":"Not Found"}

However, if I change to pasta:

podman run --name server -itd <...> -p 8081:8081 --replace server
# default pasta

I got:

curl http://localhost:8081
curl: (56) Recv failure: Connection reset by peer

If anybody knows the solution or needs more info, please give a hand 🙏 It's so kind of you!

[Luap99]

What is the server, can you share the image?
Have you check what ports pasta bound (ss -tlpn) on the host?

Is it possible that localhost connect to ::1 not 127.0.0.1 and you service in the container only listens on ipv4? Maybe just try to curl 127.0.0.1 directly.

[kingwingfly]

I switched to 127.0.0.1, and that works... (´ཀ`」 ∠)

What is the server, can you share the image?

The image is telegram bot api local server. You can download here server.tar.gz. However, it need api_id and api_hash to start...

Have you check what ports pasta bound (ss -tlpn) on the host?

$ ss -tuln | grep 8081
tcp   LISTEN 0      128                                   *:8081             *:*

Is it possible that localhost connect to ::1 not 127.0.0.1 and you service in the container only listens on ipv4? Maybe just try to curl 127.0.0.1 directly.

It's incredible that using 127.0.0.1 makes it...

$ curl http://localhost:8081
curl: (56) Recv failure: Connection reset by peer
$ curl http://127.0.0.1:8081
{"ok":false,"error_code":404,"description":"Not Found"}
$ python -m http.server
$ curl -LO http://localhost:8000/DeepSeek_R1.pdf
# here `localhost` works ...

I start a python http server on host, and I can curl it with localhost, but failed to curl the server in container ... Quite strange...

Edit:

$ getent hosts localhost
::1             localhost

Yes, it's IPv6. Thanks a looooooooooooooot!!!!!!!!!!