I'm currently having the same issue. Backups started failing on February 21, 2018 while I was away on vacation. We are running Windows Server 2012 R2 with Small Office Security 5.0-File Server. If I pause Kaspersky, I'm not able to backup. If I exit out of Kaspersky, I'm able to backup. Same question as above "Can I use the KSOS key for KES10 as well or is there another solution for KSOS?"