Question
Why were SDP clients silent upgraded even though the upgrade policy was changed to Managed Upgrade?
Answer
The reason could be due to the SDP client hasn't connected in a while and is still holding on to the old upgrade policy which it downloaded from the CMA before the upgrade policy was changed. For e.g., when the old upgrade policy was set to 'Automatic Silent Upgrade', and the administrator recently changed the upgrade policy to 'Managed Upgrade', if the SDP client didn't connect after the policy was changed, it will still be configured with the old policy of 'Automatic Silent Upgrade'. When the new version is available, the SDP client will be upgraded automatically (even though it remains disconnected).
To confirm if this is the case, we can check on the following registry key.
Computer\HKEY_LOCAL_MACHINE\SOFTWARE\CatoNetworksVPN\LastUser\UpgradeMode
0 - Managed Upgrade
1 - Automatic Silent Upgrade
2 - User Upgrade
Workarounds
Get the users to connect their SDP Client to retrieve the latest upgrade policy
In the event that step 1 is not feasible, for e.g. there are a lot of disconnected users, then make use of GPO to change the registry value to match the latest upgrade policy