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The information below is only applicable for the combination of vSphere 5.5 and Deep Security 9.5. For more details, refer to this article: Deep Security and VMware compatibility matrix.

For 9.5 Non-NSX environment, before upgrading DSVA, make sure that the Filter Driver has been upgraded to the latest version, which is compatible to the new DSVA version. Otherwise, the VMs protected by DSVA will show engine offline error.

If there is an engine offline error in Firewall and Intrusion Protection after upgrading DSVA, upgrade the Filter Driver first, then clear the warning message to see if the VM is now online.

When upgrading from Deep Security 9.5 to Deep Security 9.5 SP1, if having the vMotion environment, it is recommended to vMotion the VMs to another ESXi server first, then upgrade the Filter Driver and DSVA. After the upgrade is finished, vMotion back the VMs.

You can download the latest Deep Security Filter Driver (Filter Driver 9.5 for ESX 5.X) from Trend Micro Download Center.