Etherlite 32 not working under Linux

I have an etherlite EL-32. It was previous installed on a Solaris system, which is now dead.

I grabed the ‘dgrp-1.8’ tools from the digi web site.
I compiled & installed the drivers.
I upgraded the unit firmware to 7.9
I configured the unit using the dgrp-gui
I can rlogin into the unit. Output of ‘vers’ is below.

however, everytime I try to use dinc to talk to /dev/ttyds00 (one of the units), it says

[dirk-48] sudo ./dinc /dev/ttyds00
/dev/ttyds00: Resource temporarily unavailable

when I watch the network traffic using tcpdump, I see that my host is trying to start TCP connections to port 771 of the unit. However, there is never a response to the SYN packet.

Doing a port scan of the unit using ‘nmap’ shows only the rlogin port as being active.

what am I doing wrong?

------------ sample output from unit ------------

[dirk-43] rlogin 24hr

EL-32 EtherLite module

? ver
Product: EL-32
FW Ver: V7.9

Ethernet: 00:A0:E7:21:C2:11
IP: 10.138.241.32
GW IP: 10.138.241.3
SN Mask: 255.255.255.0
Lease: 0xACE
Boot Host: 10.138.241.3
Bootfile: el32.prm
TFTP error (1) getting Bootfile: File not found

Unfortunately, the 7.9 firmware version is fairly old and will not work with the RealPort driver. Please download and upgrade the firmware to version 1.5:

http://www.digi.com/support/productdetl.jsp?pid=2012&osvid=105#firmware

The firmware versioning started over at 1.x when the RealPort driver was designed to work with this units.