Add known issue

Author: rsgel

articles/chaos-studio/chaos-studio-fault-library.md

@@ -1653,6 +1653,7 @@ Currently, a maximum of 4 process names can be listed in the processNames parame
 * Rules are applied at the start of the action. Any external changes to the rule during the duration of the action cause the experiment to fail.
 * Creating or modifying Application Security Group rules isn't supported.
 * Priority values must be unique on each NSG targeted. Attempting to create a new rule that has the same priority value as another causes the experiment to fail.
+* The NSG Security Rule **version 1.1** fault supports an additional `flushConnection` parameter. This functionality has an **active known issue**: if `flushConnection` is enabled, the fault may result in a "FlushingNetworkSecurityGroupConnectionIsNotEnabled" error. To avoid this error temporarily, disable the `flushConnection` parameter or use the NSG Security Rule version **1.0** fault.
 
 
 ### Service Bus: Change Queue State

articles/chaos-studio/chaos-studio-limitations.md

@@ -36,7 +36,9 @@ The following are known limitations in Chaos Studio.
 ## Known issues
 - When selecting target resources for an agent-based fault in the experiment designer, it's possible to select virtual machines or virtual machine scale sets with an operating system not supported by the fault selected.
 - When running in a Linux environment, the agent-based network latency fault (NetworkLatency-1.1) can only affect **outbound** traffic, not inbound traffic. The fault can affect **both inbound and outbound** traffic on Windows environments (via the `inboundDestinationFilters` and `destinationFilters` parameters).
-- When filtering by Azure subscriptions from the Targets and/or Experiments page, you may experience long load times if you have many subscriptions with large numbers of Azure resources. As a workaround, filter down to the single specific subscription in question to quickly find your desired Targets and/or Experiments. 
+- When filtering by Azure subscriptions from the Targets and/or Experiments page, you may experience long load times if you have many subscriptions with large numbers of Azure resources. As a workaround, filter down to the single specific subscription in question to quickly find your desired Targets and/or Experiments.
+- The NSG Security Rule **version 1.1** fault supports an additional `flushConnection` parameter. This functionality has an **active known issue**: if `flushConnection` is enabled, the fault may result in a "FlushingNetworkSecurityGroupConnectionIsNotEnabled" error. To avoid this error temporarily, disable the `flushConnection` parameter or use the NSG Security Rule version **1.0** fault.
+
 
 ## Next steps
 Get started creating and running chaos experiments to improve application resilience with Chaos Studio by using the following links: