After upgrading the core server to 2017.3, or applying a Service Update to 2017.3, Remote Control may fail for users that are not in the "LANDesk Administrators" group. The following error(s) may occur:
"The signed rights document was not valid. authentication failed." "You do not have rights to access the remote computer."
The 2017.3 Core uses different access for the folder "C:\Program Files\LANDesk\Shared Files\keys".
Add the local group "LANDesk Management Suite" to "C:\Program Files\LANDesk\Shared Files\keys" with "Read & Execute" permissions on the core server.
In addition, "List Folder Contents" and "Read" permissions may resolve the issue.