Provided host localhost could NOT be bound. Please provide a different host address or hostname

Question

suddenly i start getting following error on "ng serve" command.

Provided host localhost could NOT be bound. Please provide a different host address or hostname

not sure what triggered this error. using --host 0.0.0.0 works but i'm using auth0 for login authentication which doesn't allow 0.0.0.0. i searched for solution but couldn't find any that point's to the cause or that solves it for localhost. Anybody have idea how to fix this? Thank you!

i'm using node 9.10.1, angular-cli 1.7.4, OS: darwin x64

Answer 1

not sure what caused it. but running sudo route -n flush and restarting computer fixed it for me.