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HA Pair Fault for no apparent reason?

We are running two XG 210 in active passive HA pair.  They have been running fine.  The units ran through the normal firmware update a week ago just fine to SFOS 17.1.4 MR-4.  This evening, the HA pair faulted.  The primary became stand alone, and the secondary was not available anywhere.  The front of both units looked normal.  I looked through the logs on the primary/stand alone and see that the system ran through firmware detected notices for access points and then the secondary went MIA.  I had to power cycle the secondary unit to get it to come back to life. I checked all of the switch logs that these units connect to and see no corresponding network actions on the ports when this occurs.

 

1/9/2019 17:50 Up2Date Failed Failed to check for updates
1/9/2019 17:50 Up2Date Failed Failed to check for updates
1/9/2019 17:50 HA Successful Appliance with appliance key C22053M9GBH93FD becomes standalone
1/9/2019 17:49 Up2Date Failed Failed to check for updates
1/9/2019 17:49 Wireless Protection new firmware detected for RED15w: 1
1/9/2019 17:49 Wireless Protection new firmware detected for AP55C: 9400-wifi-559fb8b-8210b6d
1/9/2019 17:49 Wireless Protection new firmware detected for AP55: 9400-wifi-559fb8b-8210b6d
1/9/2019 17:49 Wireless Protection new firmware detected for AP50: 9400-wifi-745ce15-8210b6d
1/9/2019 17:49 Wireless Protection new firmware detected for AP30: 9400-wifi-745ce15-8210b6d
1/9/2019 17:49 Wireless Protection new firmware detected for AP15C: 9400-wifi-559fb8b-8210b6d
1/9/2019 17:49 Wireless Protection new firmware detected for AP15: 9400-wifi-559fb8b-8210b6d
1/9/2019 17:49 Wireless Protection new firmware detected for AP100X: 9400-wifi-559fb8b-8210b6d
1/9/2019 17:49 Wireless Protection new firmware detected for AP100C: 9400-wifi-559fb8b-8210b6d
1/9/2019 17:49 Wireless Protection new firmware detected for AP100: 9400-wifi-559fb8b-8210b6d
1/9/2019 17:49 Wireless Protection new firmware detected for AP10: 9400-wifi-745ce15-8210b6d



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