[Bug]: port (-p flag) connection reset by peer
- Dominant language
- Swift
- Stars
- 49.9k
- Forks
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- Avg merge
- 1d 20h
- Merged PRs (30d)
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Description
### I have done the following
- [x] I have searched the existing issues
- [x] If possible, I've reproduced the issue using the 'main' branch of this project
### Steps to reproduce
Create a Dockerfile:
```
FROM node:alpine
WORKDIR /app
RUN echo 'const http = require("http"); \
const server = http.createServer((req, res) => { \
res.writeHead(200, {"Content-Type": "text/plain"}); \
res.end("Hello world"); \
}); \
server.listen(5866, () => { \
console.log("Server listening on port 5866"); \
});' > server.js
CMD ["node", "server.js"]
```
Build:
```
container build -t port-test .
```
Run:
```
container run --rm --name port-test -p 5866:5866 port-test
```
❌ Test issue:
```
❯ curl http://localhost:5866
curl: (56) Recv failure: Connection reset by peer
❯ curl http://127.0.01:5866
curl: (56) Recv failure: Connection reset by peer
```
Note that using port works out, e.g.
```
❯ container inspect port-test | jq '.[0].networks[0].ipv4Address'
"192.168.64.10/24"
❯ curl http://192.168.64.10:5866
Hello world%
```
### Current behavior
Binding port with `-p` flag when running the container appears to be configured but connections are immediately reset when accessed through `localhost` or `127.0.0.1`.
Direct container IP access works fine though.
### Expected behavior
As with Docker or Podman, being able to access a bound port through `localhost` or `127.0.0.1`.
### Environment
```markdown
- OS: macOS 26.2
- Xcode: 26.2
```
### Relevant log output
```shell
N/A
```
### Code of Conduct
- [x] I agree to follow this project's Code of Conduct
Contributor guide
Research direction
Reproduce the issue with the supplied Dockerfile, `container build`, `container run -p 5866:5866`, and localhost curl commands, then compare them with direct container-IP access. Trace the port-forwarding path responsible for localhost connections; done means the Node server is reachable through both localhost and 127.0.0.1 without connection resets.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- docker, macos, node.js
- Domain
- networking
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100