[ovirt-users] noVNC error.

Hi: I use novnc console can connect to engine vm. But when I using novnc console connect to other vm in other datacenter, failed. The ovirt-websocket-proxy log is: Jan 19 15:43:32 ooeng.tltd.com ovirt-websocket-proxy.py[1312]: 192.168.10.104 - - [19/Jan/2021 15:43:32] connecting to: ohost2.tltd.com:5900 (using SSL) Jan 19 15:43:32 ooeng.tltd.com ovirt-websocket-proxy.py[1312]: ovirt-websocket-proxy[24096] INFO msg:824 handler exception: [SSL: UNKNOWN_PROTOCOL] unknown protocol (_ssl.c:618) What reason ?