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I just upgraded my single node lab from 2.4 patch 9 to 2.6 and after the upgrade completed, the application server is stuck in an initializing state. Not looking very promising on 2.6 so far...
I am running into some of the same issues as you, though I only have a GigabitEthernet1 "physical" interface. I followed this guide to set it up (https://www.cisco.com/c/en/us/td/docs/wireless/controller/9800/9800-cloud/installation/b-c9800-cl-instal...
