We have ZD1100 managing 8 AP's, few are connected on the same LAN as the ZD, and the others are on remote site and reach the ZD via IPSec VPN.
I upgraded the ZD from 9.5.1 to 9.7.1, it seemed to work well and the directly connected AP's upgraded fin...
Just an update:
I did the following which resolved the issue:
1. Set "Tunnel MTU" option to 1400
2. Reboot remote AP's
3. Upgrade ZD to 188.8.131.52.13
After the ZD came up, all AP's were upgraded successfully.
I am not sure what solved the problem ...
I'm afraid I can't find the logs anymore, it might have been cleared.
All remote AP's were impacted (those not in the same LAN as the ZD). Upgrading as standalone is not a good option for me as those are remote sites.
I planned to check the fi...