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vercel__next.js/errors/reserved-port.mdx
Jam Balaya e5e1cfe4c8 docs: add bash filename=Terminal to code block (#72281)
## Summary
Add `bash filename="Terminal"` to improve readability.

### Improving Documentation

- [x] Run `pnpm prettier-fix` to fix formatting issues before opening
the PR.
- [x] Read the Docs Contribution Guide to ensure your contribution
follows the docs guidelines:
https://nextjs.org/docs/community/contribution-guide

Co-authored-by: Delba de Oliveira <32464864+delbaoliveira@users.noreply.github.com>
2024-11-05 07:28:23 +00:00

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---
title: Reserved Port
---
## Why This Error Occurred
Server was started on a reserved port. For example, `4045` is reserved for the Network Paging Protocol (npp).
```bash filename="Terminal"
next start -p 4045
```
or
```bash filename="Terminal"
next dev --port 4045
```
Starting the server on a reserved port will result in an error.
## Possible Ways to Fix It
Change the provided port to ensure it's not listed in the [Port Blocking](https://fetch.spec.whatwg.org/#port-blocking) section of WHATWG's fetch spec.
## Useful Links
- [Port blocking](https://fetch.spec.whatwg.org/#port-blocking)