Although I realize this probably isn't what the poster wants to do, technically, I was able to get it to work several years ago on release 8.9.
There was a standalone SQL Server database which contained several custom JDE tables. It served as part of an integration with a manufacturing point solution. The primary JDE database was Oracle on UNIX. The SQL Server tables were mapped via OCM and were accessed by UBEs running on an HP-UX server via JDBNET.
The standalone SQL Server database was consolidated onto a SQL Server cluster, and as such, became a named instance.
It wasn't obvious at first how to set it up, but it eventually worked.