The Managed Metadata Service "Managed Metadata Service" is inaccessible

My manage metadata service is suddenly stop working after i reboot the server. I check

• Service is running in central admin
• Account running under app pool is still work
• App pool  running this service is not stop

I try to do iisreset and even restart machine one more time to see if it does any good but no luck. I decided to recreate the manage metadata service. Here are step to create

1. Delete broken metadata service but DO NOT DELETE DATABASE (ex: meta1)
2. create a new metadata service using same app pool and new database name (ex: meta2)
3. Go back and change the name of the database to broken metadata service database  (meta1)
4. delete the new metadata service Database just create. (meta2)

That should back to normal.