Most apps stopped due to invalid digital signature

English QNAP App
1

Model : TS-133 (single bay)
OS : 5.2.7.3256 build 20250913

Most of my apps have been stopped, due to the error below:

[App Center] {app name} has an invalid digital signature. The app has stopped and cannot be installed on QTS. You can remove it in the App Center.

The apps are : QTS SSL Certificate, File Station 5, SMB Service, License Center, myQNAPcloud, Resource Monitor, Notification Center, ] QuLog Center.

This occurred about four hours after the NAS’s weekly reboot.

There is no mention of the certificates expiring in any of the messages received (via email from the NAS).

How do I resolve the issue? I cannot update the OS, as it’s the latest available OS for this model.

2

So there’s a couple options:

1.) Remove the apps and reinstall them. See if that fixes things.

2.) In settings allow apps to run w/o a valid signature:

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I would choose number 1 as they are all QNAP apps and reinstalling the apps should fix the issue.

3

You can refer to this FAQ article:
What should I do if I see the log ”Detected expired digital signature for…“ after restarting my NAS? | QNAP

4

Thanks for your replies. The certificates had not expired.
I rebooted the NAS & all was ok again. Very strange indeed.