Netware OES and iPrint

I successfully uploaded drivers to the RMS in the print broker a few
days ago. I have done this multiple times.
I downloaded the latest batch of windows updates today and immediately
started to get 'HTTP 401 unauthorized' errors when trying to upload
drivers to the broker.
I read a few TIDS and tried the new iPrint client 4.06. I then got the
'Winsock 10061- The remote party has refused your connection errors'
when trying to upload drivers.
I then applied the latest available winsock patch (wsock6g.exe), but the
error has not gone away.

It strikes me that something in the windows update has broken this
process? Everything was working fine before.