When upgrading to ITMS 8.7.2, the upgrade on the Notification Server was successful, but 5 of the Site Servers failed to successfully upgrade the Sym Agent while over 10 were successful.
ITMS 8.7.2
Found that the AeXNSEvent.dll file, found in the C:\Program Files\Common Files\Altiris folder was interferring with the install. To resolved this we: