Could you share how you resolved this? Thank you
I disable LTE/4G. Then using 3G/HSPA, i'm able to connect.
Tested a few times and confirm it is due to 4G/LTE issue.
Interesting.. could be because LTE/4G uses IP sharing and your VPN cannot be able to pass through NAT or maybe it is an LTE framing issue.
That's why OpenVPN is so attractive..