I came across this error whilst trying to update the sophos enterprise console from version 5.4.0 to 5.4.1 with the sophos DB installed on an SQL Cluster.
When running the installer i got an error with no initial indication as to what was causing the problem.
In the logs I checked for "Return value 3" then above this i found this in the logs.
CheckForUnsupportedEndpoints: Checking MAC computers...
CheckForUnsupportedEndpoints: RMS found with unsupported version: 0.0.0. The threshold is: 9.4.0
CheckForUnsupportedEndpoints: Checking UNIX computers...
CheckForUnsupportedEndpoints: Checking LINUX computers...
CheckForUnsupportedEndpoints: RMS found with unsupported version: 0.0.0. The threshold is: 9.12.3
CheckForUnsupportedEndpoints: Checking vSHIELD computers...
CheckForUnsupportedEndpoints: Error 0x2: You have managed computers running a version of RMS unsupported by Enterprise Console. Aborting installation.
CustomAction CheckForUnsupportedEndpoints returned actual error code 1603 (note this may not be 100% accurate if translation happened inside sandbox)
Action ended 17:05:41: CheckForUnsupportedEndpoints. Return value 3.
Action ended 17:05:41: INSTALL. Return value 3.
I had previously removed an Linux machine as it wasn't supported as per this KB https://community.sophos.com/kb/en-us/124873
in the console i have sorted all of the machines by the AV version and everything is correct! all the versions present in the console are supported by the new 5.4.1 installation with the new RMS!
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