I’m uncertain whether this issue started after the iOS update (possibly) or the RouterOS update (currently 7.17). Everything worked fine a few weeks ago before upgrading iOS and RouterOS.
This is a very strange issue, and I’m not sure how to debug it effectively.
Here’s what I’ve observed:
• MacOS → VPN: Everything works.
• MacOS → USB Phone Hotspot/Tethering → VPN: Everything works.
• iOS on WiFi → VPN: Everything works.
• iOS on Mobile Data (4G/5G) → VPN: It connects, but some websites (e.g., google.com, Cloudflare-protected websites) don’t work. Others, like nba.com, work without issues.
Additional details:
• Enabling or disabling Private Relay makes no difference.
• Tested with multiple mobile carriers across Europe and several iPhones, all running iOS 18.2.1.
I suspect this might be related to HSTS or a similar mechanism, but I’m unsure.
Can anyone confirm or deny this? Any suggestions on where to look or what to test would be greatly appreciated.
Thanks !