Cannot Connect via Mobile Network

Hello I am Shadowsocks-FOSS user. When I tried to use Shadowsocks via LTE, It says "HandShake Failed". I can connect Proxy via my WLAN But I cannot connect via my LTE Network. VPN Mode Works fine. Background Data Usage is enabled. Everything is well. How can i fix this Connection Problem?

Sorry for Bad English.(Not Native Speaker)

Device Info: SM-N950N arm64 Android Pie using v5.1.2 (Transparent Proxy Mode) ISP: SKTelecom