His off duty means same licence is used in two different machine.
Make sure that you have not installed same licence in two machines.
To check all the available server nearby you.
Check power tool
No other server has this license applied to it. I understand that USUALLY Off Duty is caused when the same license is applied to multiple servers, however this is not the case. No other server uses the App license and once the service is restarted, the Off Duty message goes away and the server is available.
When you practice a server start make sure that the machine that has QMC is up and running first then the machine with QVS. Also you can switch the services from " Automatic" to "automatic(delay start)", in some cases the server needs little time to connect to the network, in other words QMC to connect to QVS, so when you switch "automatic(delay start)" there is a 3 minutes wait.