Situation: The client try to use robocopy to copy files and folders with security from one server and anew server. It process for a few minutes. some folders and files miss, and then no one can access the server. This is the commond:
robocopy \\comm\TS_Share C:\ TS_Share /MIR /COPYALL /DCOPY:T /R:1 /W:1 /NP /TEE
Troubleshooting: There is the space between C:\ and TS_Share. That curses the problem and override some system files.