mmc cannot open the file C:\windows\sapmmc.msc

Hi all..

I logged into SAP server with Administrator users (My SAP systems are installed on Windows 2008 r2).

Suddenly, i cannot open or access SAP MMC any more. I see this error saying do not have sufficient rights.

I had to manually do stopsap to stop 3 systems. My question is:

why this error appeared all of a sudden, i usually start/stop SAP systems using SAP MMC.

If this problem happens again, how to check the status of all SAP systems? as hostname:5xx13 takes a lot of time and only shows individual system,

while executing stopsap, its takes a long time, is there a better way to perform stop operation?

it seems the system is taking a lot of memory/CPU, in such case remote connection is slow. So, how to perform the stop operation from outside?

thanks and regards