Originally Posted by
plunet
t's true that employer VPNs, assuming they use SSL (as opposed to a known VPN protocol like IPSEC, PPTP, etc) will typically work from within China without VPN or roaming, but only up to a point.
Don't know which protocol they use for her employers VPN but they use a GlobalProtect Gateway which seems to be very strict. E.g. she never was able to connect to the network from a public wifi but it's always working when she use her SIM card instead. Can't be a IP issue, as she used her private HK SIM card last time (in HK).
So getting her a HK eSIM with 30 GB or 45 GB will be her best choice. Thank you.