Upgrading the SEPM from MR4 to MR4 MP1 does not seem to require a reboot. (Service and console come up and work without trouble.) However, in the Windows Application Event log, there is always an Event ID 1005 logged. Does the SEPM computer actually need a reboot, or not?
Time: 5:42:29 PM
Description: The Windows Installer initiated a system restart to complete or continue the configuration of 'Symantec Endpoint Protection Manager'.
This entry is logged because a file that is replaced during the upgrade (secars.dll) is also being held by MS Internet Information Services (IIS). This usually requires a reboot, though during the SEPM upgrade the file is successfully replaced regardless.
This "The Windows Installer initiated a system restart" event log entry may safely be ignored. The server does not require a reboot in order for the SEPM to function correctly.
If IIS is stopped prior to the upgrade, the log entry will not be made. However, this will result in a loss of connectivity to the SEP clients until IIS is restarted..