Reserved Port

Why This Error Occurred

Server was started on a reserved port. For example, 4045 is reserved for the Network Paging Protocol (npp).

next start -p 4045

or

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 section of WHATWG's fetch spec.

Useful Links

• Port blocking