Hi,
While following the  ERT-Cloud quick start I've one questions which is  
Is it mandatory to Install the EC2 Instance from the public AMI (below Provided) in order to access the WebSocket API?
- Thomson Reuters Elektron Real-Time Examples - Amazon Linux AMI - ami-ccb1f0b3 
- Thomson Reuters Elektron Real-Time Examples - Amazon Linux AMI - ami-0558eef657262b708 
What about if I already have a running EC2 Instance which is not from TR AMI?