My Business Manager Not Opening 504 Gateway Time-out

My cloud Manager is not working an hour before showing this message. 504 Gateway Time-out
Any update? Please guide

Have you checked the speed test on the Cloud Customer Site Manager Cloud

How can i do that?

Did you try clicking on the link @Joe91 provided for you?

THIS IS THE MSG AFTER SPEED TEST.
Your site is being hosted in Middle East (Bahrain) data center which we have determined to be the fastest for you.

Can i restart my cloud server? what will be effect? my data will be lost or not?

No data loss occurs on restarting your server

Thank You so much guys. Restart help.
Now Its Open