SUM "Failed the checksum validation step"

Hi all,

I'm building a new installation of SEC 5.1, using a couple of SUM distribution points plus the SUM server itself.

So, SUM gets its updates from an upstream server (this works fine). Subscriptions to windows v10 recommended and OSX 8 recommended.

There are two "software distribution points" configured. Excluding real names, they are:

\\Server1.domain.local\sophossource

\\Server2.domain.local\sophossource

Both servers have the same ACLs set up (NTFS/NTFS share), and both are configured in SUM to use the same specific set of credentials for updating (said credentials allow modify access to the above locations, and I have tested this).

So what happens...

Software is distributed to both server1 and server2. I can see it happening, and can even install the endpoint sec client from both locations successfully (and update from). However, I get this error repeatedly in the SUM log:

"Deployment to share \\Server1.domain.local\SophosSource\CIDs\S000 failed the checksum validation step"

On the face of things this seems to mean nothing, but this is a new installation and I don't want to leave spurious errors when it goes live!

Any ideas please?

Thanks

Rob