Provisioning only works on startup

[Snapdragons]

After updating the firmware on a T21P, auto provisioning now fails when trying to run it manually. The only time it works is when the phone powers up, successfully downloading all files and having no problems at all.

When I try and run a provisioning manually, either through the web interface or on the phone itself, nothing happens. The TFTP server shows no activity and the log files from the phone show:

Code:

<131>Sep 25 17:01:05 ATP [1312.1321]: DURL<3+error > [DCMN]download common error, errcode:68.
<131>Sep 25 17:01:05 ATP [1312.1321]: ATP <3+error > tftp to file failed, code = -168, msg = , retry = 1
<131>Sep 25 17:01:07 GUI [1296:1296]: APP <3+error > 667.766.538:from[app_vpPhone] sync[0] msg[396175][0][0] size[36] target[0xd2919e64] not found

The web ui also shows 'auto configuration failed'.

Not sure what's going on here or why provisioning only works on boot. Any tips?