When I install client in on-line mode it will register itself in sb db. I can change policies etc. without any problems. But when I delete the PC from SBAdmin the client won't re-register itself. How to force it to do that? Or is there any other way to restore communications between client and server?
I think your only option to restore communication is to restore the computer object from the Deleted Machines bucket in SB Admin. Other than that you're probably looking at a client uninstall through Win/SafeTech or a reformat.