Unstable ZPA connected in China mianland

Hello, all;

as we are MNC branch site in China Nanjing . we have moved the connector from Tokyo to nanjing , but seems the connection performance became worse. as we try to create policy to allow all intranet applitions connect through by Nanjing office MPLS. and now we have found there’s no traffic go-through by VPN tunnel ,(and more DNS request dropped(time out),there’s local DNS server) , we have follow up the guide-line to implement connector.
anybody help me to indicate the trouble shooting possible?