Failed to connect to the zeebe gateway

Hi ,
I am having trouble to connect to the zeebe gateway. I have a zeebe broker cluster and a zeebe gateway setup, got the following client connection error:

ConnectException: Connection refused: zeebe-gateway.myzeebe/x.x.x.x:26500
Wrapped by: io.grpc.StatusRuntimeException: UNAVAILABLE: io exception

I tried to manually connect to the zeeb-gateway via telnet, it can connect.

I wonder what could go wrong?

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Please paste the connection code as a snippet.