[strongSwan] StrongSwan traffic is blocked by some ISP

[lee mike]

Hi,
   I am running a Android VPN service to middle east users. It was working
perfectly. But from yesterday many users in United Arab Emirates can not
use the service. They can connect to server, after the connection, all
traffic seems be dropped, no app can visit the network. I don't have any
log right now. I want to know if there is a way to filter out VPN's traffic
by ISP. Any way to avoid it?
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