If this issue is because you're using the FQDN, I'd say that your DNS Services are not properly configured.
On a LOCAL console connecting to a LOCAL WSUS server, you should have to, nor should you ACTUALLY, use the FQDN, you should be able to connect with the SIMPLE hostname -- if DNS is properly configured.
Lawrence Garvin, M.S., MCSA, MCITP:EA, MCDBA
SolarWinds Head Geek
Microsoft MVP - Software Packaging, Deployment & Servicing (2005-2014)
My MVP Profile: http://mvp.microsoft.com/en-us/mvp/Lawrence%20R%20Garvin-32101
http://www.solarwinds.com/gotmicrosoft
The views expressed on this post are mine and do not necessarily reflect the views of SolarWinds.