["server not found" error in task events]

Dear all, I'm facing issue when tasks run on a server. Every time it shows task cannot be run because server not found. Kindly guide.

[KSN services unavailable [MOVED]]

Dear all, I'm facing issue regard to "KSN services unavailable" on endpoints. Kindly guide how to resolve it. I have already checked server KSN connection setting and everything is perfect in all deices except 3-4 devises are showing this issue. //Mod Note: moved to proper section.