The null-IV migration for application_link_client processed 100 rows with 0 errors.

[Vox]

Hi,

Just upgraded from 8.13.1 to 9.0.6 and looking at the system activity logs I am seeing the following for every 5 minute cron run:

The null-IV migration for application_link_client processed 100 rows with 0 errors.

Any idea what this is?

[K n K Web Services]

Yeah, that's normal — nothing wrong on your end.

WHMCS tightened up their encryption in 9.0, and part of that is fixing some older data (application_link_client — your cPanel/WHM SSO tokens) that was encrypted with a static/null IV instead of a proper random one. Not great practice, so they're fixing it.

Instead of doing it all at once during the upgrade and risking locking things up, they just run it in the background — 100 rows every cron cycle until it's all converted. Once it's done, the log entry stops showing up.

Check System Health (Configuration > System Health) if you want to see the actual progress/status of it. But otherwise just let it run, it'll finish on its own.