Hi!
This is really a question for Tech Support or for the folks at your site who are responsible for starting and stopping the various servers/services. It could be that somebody stopped the metadata repository and didn't start it again or that they did not use the right options to start the metadata repository or that the metadata repository port number has changed.
Debugging a problem like this gets to pretty specific information about your particular configuration and installation setup.
To find out how to contact Tech Support, refer to:
http://support.sas.com/techsup/contact/index.html
Good luck,
cynthia