My google accounts won't sync at all

Nothing works - I can't sync contacts, can't add payment methods on Google Play, can't add files to my Google Drive - It says there's a "network error". All other apps work fine both on data and WiFi, but anything related to Google gives me the error. I tried deleting my google accounts and re-adding them, clearing cache, rebooting - Nothing helped. Why is this happening, anyone has any idea?

from Android Forums at AndroidCentral.com - Ask a Question //forums.androidcentral.com/showthread.php?t=773005&goto=newpost
via IFTTT