[2.6.42] Scanning XXXXXXX failed due to an error detected by the client.

I can not find what the problem is for this - can you shed some light?
This is coming out of ZAM 7 management console - viewing collection
server errors. They are all coming up as severe.
Also down the same road under workstation errors I am getting -
[2.1.1034] A function failed (35324 ) for the workstation. This is only
happening on a few of our workstations here and there. Any suggestions?