This article describes a debugging process when SSAS failed to connect.
Unable to connect remotely:
First find the SSAS (MSOLAP) process number from the task manager
Or run the command line:
tasklist | findstr msmdsrv.exe
Find the SSAS listening port (7052 is the process number obtained above):
netstat -ano | findstr 7052
In Windows Firewall, just open the port.