Service packs and netstorage

Can I remove a service pack? I put service pack 6 on one of my nbo2 boxes
and can no longer access netstorage. All the other gadgets appear to work
fine. I get the following error when I click on the netstorage link from
the home page after a success login:

NetStorage getData:PortalURLException URL =
http://localhost/oneNet/xtier-loginUnknown Connection Failure :500