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If the pushed request, or the response to it, is delayed then NX connections may time out before they get established. One cause of delay could be that your phone is busy doing some other task, such as updating apps. Older phones may bog down and cause the Duo push response to get delayed due to not being able to effectively do more than one task at a time. If No Machine connections are not working then give FastX a try. |
Finally, note that two-factor authentication only applies to logging into a login node of the HPC systems. Once on the system connections between nodes all use the cluster ssh keys as before.
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