FedEx Unavailable?

I been trying to print a shipping label for a few hours, and keep receiving the following error message:

Service Temporarily Unavailable (503) -
'https://gateway.fedex.com:443/web-services/ship'

How do I determine if this truly is an issue on FedEx's side, and not an issue with the program or my account? (I have never experienced this before).

Thank you.