The default value of the variable is 5 seconds and valid values are 1 up to any positive integer.
Care must be taken however when modifying this value, as changes can have a significant affect on overall cluster performance.
Please see What impact do changes to the NH_RCS_MSG_TIMEOUT or NH_RCS_RETRY_QUEUE_TIME variables have on cluster performance for more information regarding the potential impact.
The eHealth server communicates with the cluster members via an RCS - TCP connection made on ports 5050 and 50501 via the nhiRmtIn and nhiRmtOut processes.
nhiRmtIn ( remote message transfer - In ) : port 5050
nhiRmtOut ( remote message transfer - Out ) : port 5051
After eHealth opens an RCS connection, it passes the necessary messages to the remote cluster member over that connection. The remote system returns acknowledgements for the messages that it receives. If eHealth does not receive an acknowledgement within the specified timeout window, an RCS timeout will occur, and the following message will be seen:
"Rcs timed out waiting for an ack for message value. Current state is state"
This error indicates that the RCS processes need more time to receive acknowledgements from the remote systems.
The timeout value is controlled via the NH_RCS_MSG_TIMEOUT environmental variable. eHealth waits for the time specified by NH_RCS_RETRY_QUEUE_TIME, then attempts to re-establish the RCS connection and resend the message.