Application Delivery Management

Expected behaviors when issues arise

July 11, 2024

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Following are the expected behaviors of the license servers and NetScaler instances when they experience the issues described:

License server stops responding

Warning

The license server is not responding. NetScaler continues to operate with the current capacity for 30 days. After 30 days, if the connectivity to the license server is not restored, NetScaler loses its current capacity and stops processing traffic. If connectivity is restored within 30 days, NetScaler continues to operate at current capacity and continues to process traffic.

NetScaler Pooled instance stops responding

If the NetScaler Pooled instance stops responding and the license server is in a healthy state, the license server checks in all the NetScaler instance’s licenses after 10 minutes. When the instance reboots, it sends a request to check out all the licenses from the licensing server.

Both license server and NetScaler Pooled instance stop responding

If both the license server and the NetScaler Pooled instance restart and reestablish the connection, the license server checks-in all its licenses after 10 minutes, and the NetScaler Pooled instances automatically checkout the licenses after the reboot is completed.

The NetScaler Pooled instance shuts down gracefully

During a graceful shutdown, you can choose to check-in the licenses or keep the licenses that were allocated before the graceful shutdown. If you choose to check-in the licenses, the NetScaler Pooled instance is unlicensed after it restarts. If you choose to keep the licenses, they are checked in to the licensing server when the instance shuts down. After the instance restarts, it reestablishes the connection with the licensing server and checks out the licenses as specified in the saved configuration.

If the system reboots and the checkout fails due to no capacity available in the pool, NetScaler checks the inventory of NetScaler Console pool licenses and checks out any available capacity. An SNMP alarm is raised to notify this condition to the user if NetScaler is not running at full capacity as per the configuration. If no capacity is available in the bandwidth pool, the pool instance becomes unlicensed.

Network connectivity issues

Error message (syslog)

License server is not responding.

If the license server and NetScaler Pooled instances are in a healthy state but the network connectivity is lost, the instances continue to operate at their current capacity for 30 days. After 30 days, if the connectivity to the license server is not restored, the instances lose their capacity and stop processing traffic, and the license server checks-in all its licenses. After the license server reestablishes connectivity with the NetScaler instances, the instances checkout the licenses again.

Grace period

When a NetScaler Pooled instance is in a healthy state and the license server stops responding, the instance continues to operate with the current capacity for 30 days. If the connectivity to the license server is not restored after 30 days, the instance loses its capacity and stops processing traffic.

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Expected behaviors when issues arise

July 11, 2024

Contributed by:

July 11, 2024

Contributed by:

Expected behaviors when issues arise

License server stops responding

NetScaler Pooled instance stops responding

Both license server and NetScaler Pooled instance stop responding

The NetScaler Pooled instance shuts down gracefully

Network connectivity issues

Grace period

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