clusterUrl

[king804]

when i try to connection
it prompt me exception "Exception:Unable to get URL from cluster (http://ortc-prd-useast1-s0001.realtime.co)"

It is my source code as below:
RCTRealtimeMessaging.RTConnect(
{
appKey:this.state.appKey,
token:this.state.token,
connectionMetadata:this.state.connectionMetadata,
clusterUrl: "http://ortc-developers.realtime.co/server/2.1/"
});