This is a pretty annoying error that prevents you from connecting for no apparent reason. Simply follow these few steps to solve it: Erase your DNS Cache
- Press Win + R
- type “ipconfig /flushdns” without the quotation marks and press enter
Then connect and play! Have fun!
Found at: http://answers.ea.com/t5/Battlefield-4-Deutsch/Origin-konnte-den-Code-nicht-abrufen-5df70000-Base-proxy-error/td-p/2210863