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Troubleshooting high availability issues

May 2, 2023

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The most common high availability issues involve the high availability feature not working at all, or working only intermittently. Following are common high availability issues, and probable causes and resolutions.

Issue The inability of the NetScaler appliances to pair the NetScaler appliances in a high availability setup.
- Cause
  
  Network connectivity
  
  Resolution
  
  Verify that both the appliances are connected to the switch and the interfaces are enabled.
- Cause
  
  Mismatch in the Password for the default Administrator account
  
  Resolution
  
  Verify that the password on both the appliances is the same.
- Cause
  
  IP conflict
  
  Resolution
  
  Verify that both the appliances have unique NetScaler IP (NSIP) address. The appliances should not have the same NSIP address.
- Cause
  
  Node ID mismatch
  
  Resolution
  
  Verify that the Node ID Configuration on both the appliances is unique. The appliances should not have the same Node ID configuration. Additionally, you must assign value for a Node ID between 1 and 64.
- Cause
  
  Mismatch in the password of the RPC node
  
  Resolution
  
  Verify that both the nodes have the same RPC node password.
- Cause
  
  An administrator has disabled the remote node
  
  Resolution
  
  Enable the remote node.
- Cause
  
  The Firewall application has blocked the heartbeat packets
  
  Resolution

Verify that the UDP port 3003 is allowed.

Issue Both the appliances claim to be the primary appliance.
- Cause
  
  Missing heartbeat packets between the appliances
  
  Resolution
  
  Verify that the UDP port 3003 is not blocked for communication between the appliances.
Issue The NetScaler appliance is not able to synchronize the configuration.
- Cause
  
  A Firewall application is blocking the required port.
  
  Resolution
  
  Verify that the UDP port 3010 (or UDP port 3008 with secure synchronization) is not blocked for communication between the appliances.
- Cause
  
  An administrator has disabled synchronization.
  
  Resolution
  
  Enable synchronization on the appliance that has the issue.
- Cause
  
  Different NetScaler releases or builds are installed on appliances.
  
  Resolution
  
  Upgrade the appliances to the same NetScaler release or build.
Issue Command propagation fails between the appliances.
- Cause
  
  A Firewall application is blocking the port.
  
  Resolution
  
  Verify that the UDP port 3011 (or UDP port 3009 with secure propagation) is not blocked for communication between the appliances.
- Cause
  
  An administrator has disabled command propagation.
  
  Resolution
  
  Enable command propagation on the appliance that has the issue.
- Cause
  
  Different NetScaler releases or builds are installed on appliances.
  
  Resolution
  
  Upgrade the appliances to the same NetScaler release or build.
Issue The NetScaler appliances in the high availability pair are unable to run the force failover process.
- Cause
  
  The Secondary node is disabled.
  
  Resolution
  
  Enable the secondary node.
- Cause
  
  The Secondary node is configured to stay secondary.
  
  Resolution
  
  Set the secondary high availability status of the secondary node to Enable from Stay Secondary.
Issue The secondary appliance does not receive any traffic after the failover process.
- Cause
  
  The upstream router does not understand GARP messages of NetScaler appliance.
  
  Resolution
  
  Configure virtual MAC address on the secondary appliance.

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Troubleshooting high availability issues

May 2, 2023

Contributed by:

May 2, 2023

Contributed by:

Troubleshooting high availability issues

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