If you did have the ISO on before you install, it fails when you run the CU upgrade because it cannot talk to Active Directory. If the IDS option is enabled, you cannot mount the ISO or copy it as it gives a signature error. The IDS section seems to block file copy and also blocks installations. In a recent article, I spoke about Symantec Endpoint Detection and Response causing issues on Exchange.
Antivirus blocking the installation - EDR component.I have listed some of the common examples that I have personally come across when upgrading Exchange Servers, and the services won’t start. Services that won’t stop while the upgrade is running.Pending reboots from updates of other applications or Windows updates.Third-party applications terminating PowerShell.What can lead to this? Here are some examples that we will cover in a bit more detail:
But there are times you end up with an installation that fails, or it seems that the upgrade went through but Exchange services won’t start. Upgrading Exchange 2016 or 2019 with the latest cumulative update (CU) or security update (SU) normally finishes without an error.
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