Troubleshooting the Citrix ADC cluster
If a failure occurs in a Citrix ADC cluster, the first step in troubleshooting is to get information on the cluster instance and the cluster nodes by running the show cluster instance <clId> and show cluster node <nodeId> commands respectively.
If you are not able to find the issue by using the above two approaches, you can use one of the following:
Isolate the source of the failure. Try bypassing the cluster to reach the server. If the attempt is successful, the problem is probably with the cluster setup.
Check the commands recently executed. Run the history command to check the recent configurations performed on the cluster. You can also review the ns.conf file to verify the configurations that have been implemented.
Check the ns.log files. Use the log files, available in the /var/log/ directory of each node, to identify the commands executed, status of commands, and the state changes.
Check the newnslog files. Use the newnslog files, available in the /var/nslog/ directory of each node, to identify the events that have occurred on the cluster nodes. You can view multiple newnslog files as a single file, by copying the files to a single directory, and then running the following command:
nsconmsg -K newnslog-node<id> -K newnslog.node<id> -d current
If you still cannot resolve the issue, you can try tracing the packets on the cluster or use the show techsupport -scope cluster command to send the report to the technical support team.