Why does Jenkins complain that my reverse proxy setup is broken?

Question

I have no idea why after Jenkins is updated to version 1.591 (Ubuntu Server 12.04), the originally correctly set up reverse proxy now becomes broken. My current setting is e

Answer 1

It's trying to verify the url specified in the setting with the actual one:

1. go to manage jenkins
2. configure system
3. jenkins URL
4. change the url to your public IP address
5. save