Failed to start devlopment server — BindError: Unable to find a consistent port localhost

Question

Google-app-engine development server runs great yesterday, but when I try to start it today. It only shout out this Error.

I tried use lsof -i:8080 / <

Answer 1

This can be caused by multiple entries in your hosts file for 'localhost'.

For example in file /etc/hosts:

127.0.0.1 localhost
127.0.0.1 mymachinename localhost

if you delete all mappings but one for localhost, the problem will hopefully be resolved.

127.0.0.1 mymachinename localhost

This is a known issue and as far as I understand it will be corrected in a future release.