You can log onto the Windows server that has the ZCM installed using the ZCM account,
and can reach the login page but when logging-in get "User Validation Error    




   The issue is related to the upgrade of the ZCM or the domain that was updated since the ZCM was installed    




In the machine running the ZCM
1. open the file C:\Program Files\Zerto\ZCM\tweaks.txt
2. add a line with the tweak
3. Save the file