I am having a very weird issue off a UCM6208. I have templates set up in Zero Config for 2135, 2170, 2140 phones as well as the DECT DP752. The DP752 devices are connected via OpenVPN and are offsite. They seem to be picking up their settings just fine when you tell the phones to provision. Devices on the local LAN see the UCM and, in fact, pick up the correct config path when you manually kick off provisioning in Zero Config. But then the phones display the username/password prompt on the LCD and stop any further processing.
I have other 6204’s and 6202’s running happily and provisioning via Zero Config with no issue. Not sure what is happening here. In all cases I am setting an explicit admin password in the Zero Config settings. I have tried factory reset of the phones, I have also explicitly set the admin password on the phones to match what I am setting in Zero Config … no luck.
All UCM’s running the latest firmware, 22.214.171.124. The 6208 has locked up once or twice requiring a hard power reset, not sure if that might have something to do with the issue.
Any and all ideas gratefully accepted!