OTRS 6 POP3 suddenly stopps

In case your OTRS stopps fetching Mails from your Exchange Server:

Open  „Exchange Management Shell“ 

(Get-ServerComponentState -Identity NAMEOFYOURSERVER -Component PopProxy).LocalStates

Watch the brackets! 

In case you get „inactive“:

Set-ServerComponentState -Identity NAMEOFYOURSERVER -component PopProxy -state Active -requester HealthAPI

Parallels Desktop booting Problems

1. Turn Off Mac.
2. Hold CMD+R and start Mac.
3. Hold until the Mac boot into Recovery Mode.
4.  Go to Utilities -> Terminal 
5. Run the commands: csrutil disable press Enter Key then type reboot.