Problem with Photon Client iOS SDK connect to Photon Server SDK host in VPS

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Currently, I'm using Photon Server SDK version 4 and I'm have one VPS running Photon control on there ,
At client side, My game use Playfab service save player data. And I'm use API MatchMaker of Playfab get all infomation server running Photon Server Control ,
I'm use Photon iOS client SDK try to connect to my photon server it can not connect successfully I'm always look see it disconnect. I do not know the reason for disconnection details. I don't known why I don't can connect it success. Can you help me solve the my problem?

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