https://community.cisco.com/t5/collaboration-applications/mra-ntp-failure-surprising-solution-but-what-went-wrong/m-p/4568076#M47358 <P>We are running Expressway MRA&nbsp;X12.5.6. The other day, the external servers had trouble syncing with NTP.&nbsp;</P><P>&nbsp;</P><P>Right after a reboot, NTP would sync up, but within a few minutes the jitter would climb to around 60000, the status would be REJECT, and time would be unsynchronized. When in this state, Jabber users would not work properly.</P><P>&nbsp;</P><P>We also had a pair of Expressways in the same subnet for video conferencing that kept working properly with the same NTP servers.</P><P>&nbsp;</P><P>There had been zero configuration changes between the successful operation of the MRA Expressways until they started to have this NTP problem. Various troubleshooting attempts did not yield success.</P><P>&nbsp;</P><P>Eventually, the fix was to restore the two external MRA Expressways from backups. Everything started to work.</P><P>&nbsp;</P><P>My question is what went wrong? I would appreciate any reasoned speculation so we can come up with some sort of explanation what may have happened so we can monitor for such in the future.&nbsp;</P> Thu, 10 Mar 2022 14:19:56 GMT derek.andrew 2022-03-10T14:19:56Z https://community.cisco.com/t5/collaboration-applications/mra-ntp-failure-surprising-solution-but-what-went-wrong/m-p/4568076#M47358 <P>We are running Expressway MRA&nbsp;X12.5.6. The other day, the external servers had trouble syncing with NTP.&nbsp;</P><P>&nbsp;</P><P>Right after a reboot, NTP would sync up, but within a few minutes the jitter would climb to around 60000, the status would be REJECT, and time would be unsynchronized. When in this state, Jabber users would not work properly.</P><P>&nbsp;</P><P>We also had a pair of Expressways in the same subnet for video conferencing that kept working properly with the same NTP servers.</P><P>&nbsp;</P><P>There had been zero configuration changes between the successful operation of the MRA Expressways until they started to have this NTP problem. Various troubleshooting attempts did not yield success.</P><P>&nbsp;</P><P>Eventually, the fix was to restore the two external MRA Expressways from backups. Everything started to work.</P><P>&nbsp;</P><P>My question is what went wrong? I would appreciate any reasoned speculation so we can come up with some sort of explanation what may have happened so we can monitor for such in the future.&nbsp;</P> Thu, 10 Mar 2022 14:19:56 GMT https://community.cisco.com/t5/collaboration-applications/mra-ntp-failure-surprising-solution-but-what-went-wrong/m-p/4568076#M47358 derek.andrew 2022-03-10T14:19:56Z