Permanently blocked port on Macos High Sierra

March 27, 2018

Short note with quick solution.

For some time my react app was constantly refusing to run on localhost:3000. For some time I thought that maybe there’s some forgotten node process still running in the background.

After some investigation I found that something changed on MacOS High Sierra networking setup and localhost is often not resolved to

Adding localhost into /etc/hosts seems like a solution for this issue.