First upgrade the Data Security Management Server and any supplemental Data Security servers. Then upgrade Data Security endpoints. Upgrade endpoints by deploying the 7.6 version of them to their current locations. See
Deploying Websense endpoints.
It is possible that some endpoints are not connected to the network or are unavailable for upgrade for some other reason. These endpoints will continue to function and be able to identify breaches and create incidents. They will operate according to the last policy applied to it.
In version 7.6, you can configure prior-version endpoints to operate in monitoring mode until they are updated. In this mode, the endpoints only audit actions and do not block.
Data Security Management Server is upgraded to be part of the version 7.6 TRITON Unified Security Center. Note that during upgrade, if there are multiple network interfaces on the machine, you can choose a different IP address than that currently used. If you do so, endpoint clients configured to connect to endpoint servers on this machine will no longer be using the correct IP address. A solution to this situation is create a version 7.6 Data Security supplemental server using the old IP address so endpoint clients can still connect to it and (optionally) remove it after the endpoints have been updated to version 7.6 (connecting to the new IP address).