With the Columbus Client (former ix1-connect/WS) and the Novell 32bit Client it is not possible to use SPX connections. For example a Remote Console cannot be started over the ISDN line.
The problem is an objectionable and wrong selection or assignment of the primary board by the IPX protocol. The primary board refers to a logical board from the network configuration of Windows 95 and serves applications that are capable of maintaining only one connection to the network. Thus concerning, e.g. all 16 Bit IPX and SPX applications.