I'm getting the error:
"Error: File Protocol error occurred: cannot open the NSS version file on the selected server. The NSS software may not currently be running on this server."

This is a new OES11sp3 box; NetWare and openwbem don't apply.
Another server that was set up two weeks prior the same way is fine.

The data is accessible via UNC, and NSSMU seems to work fine. The NSS admin object is there, and I myself am definitely LUM enabled for every server.
Users do complain of intermittent access which a reboot fixes, but I'm not sure if this is a red herring or not.