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next.js/errors/reserved-port.mdx
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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)