Hi @1986sudipta - the “RST_STREAM with code 0” message means that communication with the gRPC server was closed prematurely, which often indicates a network issue. gRPC requires HTTP/2 - the first thing I would check is to make sure that your AKS ingress is configured to accept HTTP/2 connections.
Another thing you can do to eliminate Modeler as being an issue is to use a different tool, such as zbctl. If zbctl connects but Modeler doesn’t, then the issue with Modeler (or the configuration inside Modeler); if neither connect, the issue is likely with the deployment.