Both OWA and ECP generate exception: Event 4020 - Process w3wp.exe. Got unhandled exception in ProvisioningCache activity

Question

I have noticed two frequent errros:

Process w3wp.exe (OWA) (PID=12932). Got unhandled exception in ProvisioningCache activity ProvisioningCache Diagnostic command receiver, the activity is terminated. Exception: Thread was being aborted.

Process w3wp.exe (ECP) (PID=7760). Got unhandled exception in ProvisioningCache activity ProvisioningCache Diagnostic command receiver, the activity is terminated. Exception: Thread was being aborted..

generatd on Exchange 2013 CU19
Build Number: 15.00.1365.001

I have already tried with:
*Reset-ProvisioningCache -Application ECP -Server server.my.domain -GlobalCache *
but the errors keep appearing

I have also noted that quite frequently Activesync clients are disconnected in mass and cannot reconnect for a while.

Answer 1

Upgrade has already being considered but our policy is very conservative in this respect. If the problem does not go away with other fixes, the upgrade will become more possible.

Your policy should be to be at latest CU plus security updates since there are active exploits in the wild that can easily compromise your server. :)

https://techcommunity.microsoft.com/t5/exchange-team-blog/released-november-2021-exchange-server-security-updates/ba-p/2933169

This is a serious vulnerability and should be addressed. Your servers should be updated immediately.

https://techcommunity.microsoft.com/t5/exchange-team-blog/proxyshell-vulnerabilities-and-your-exchange-server/ba-p/2684705