This is what worked for me.
Open game in window mode (i personally did reset system settings in launcher options) hit the start button and at moment when your connecting data center your anty-virus/firewall should popup a window asking if u want to allow new process (something must have changed in processes after patch) hit yes, and tahts what worked for me. Dont know why this popup wont appear on full-screen mode and why its appearing at all (i have FFXIV i exceptions folder). Nevertheless u can at least try this, maybe it'll help some1 else