This article describes how to enable session reliability on NetScaler in high availability.

Background

When high availability failover occurs, the ICA sessions will get disconnected. In order to avoid the ICA session disconnection on high availability failover, you can configure Session Reliability.

Points to Note

• NetScaler appliances should be running on software version 11.1 build 49.16 or later.
• You should not Enable or disable Session Reliability mode when the NetScaler appliances have active connections.
• Enabling or Disabling the feature when connections are still active causes HDX Insight to stop parsing those sessions after a failover occurs and result in loss of information about the sessions.

Instructions

To configure Session reliability from NetScaler CLI

1. At the command line, use the default system administrator credentials to log on to the system.
2. To enable Session Reliability on HA failover, at the prompt, type: 
   set ica parameter EnableSRonHAFailover YES
3. To disable Session Reliability on HA failover, at the prompt, type: 
   set ica parameter EnableSRonHAFailover NO

To Enable Session reliability on HA failover from NetScaler GUI

1. In a web browser, type the IP address of the primary NetScaler instance in the HA pair.
2. In User Name and Password, enter the administrator credentials.
3. On the Configuration tab, navigate to System > Settings, and click Change ICA Parameters.
4. In in the Change ICA parameters section, select Session Reliability on HA Failover.
5. Click OK. 

Limitations

• Enabling this feature will result in increased bandwidth consumption which is due to ICA compression being turned off by the feature, and the extra traffic between the primary and secondary nodes to keep them in sync.
• This feature is supported in Active-Passive mode only. Active-Active mode is not currently supported.