28 lines
541 B
Text
28 lines
541 B
Text
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---
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title: Reserved Port
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---
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## Why This Error Occurred
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Server was started on a reserved port. For example, `4045` is reserved for the Network Paging Protocol (npp).
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```
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next start -p 4045
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```
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or
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```
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next dev --port 4045
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```
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Starting the server on a reserved port will result in an error.
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## Possible Ways to Fix It
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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.
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## Useful Links
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- https://fetch.spec.whatwg.org/#port-blocking
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