Load balancing doesn't work intermittently with Tungsten fabric

[rajujith]

ISSUE TYPE

• Bug Report

COMPONENT NAME

Tungsten Fabric

CLOUDSTACK VERSION

CloudStack 4.18/ 4.18.1 nightly builds 

CONFIGURATION

Advanced zone with Tungsten fabric deployed with Tungsten as LB provider, default Tungsten fabric offering would do.

OS / ENVIRONMENT

Tungsten Fabric R5.0, KVM

SUMMARY

When configuring Load Balancing with Tungsten Fabric based zone although the load balancer configuration is applied successfully it doesn't work at times. The connectivity fails from the client. The service instance appears to be configured as per the Tungsten Fabric controller.

STEPS TO REPRODUCE

1. In a Tungsten fabric integrated zone created a guest network using the offering _DefaultTungstenFarbicNetworkOffering_
2. Deploy a VM in the above network.
3. Acquire a new public IP in the guest network and configure the load balancing rule and firewall to allow the same. 
4. Try connecting to the public IP:port using telnet or desired client. 
5. If the above it working, remove the LB rule and add the same rule again or acquire a new public IP and repeat the same. 

EXPECTED RESULTS

The load balancer should be configured on Tungsten Fabric to allow connectivity

ACTUAL RESULTS

Although the load balancer configuration seems to be applied at the Tungsten  Fabric by the CloudStack the connectivity is not possible intermittently.