Hi all,

I've managed to get it running ;-)
HW: Sunray1
Server: jOpenray on Win2003 server

Since I no longer have SRSS available I needed to specify the server
address via DHCP.
This was the tricky part:

On a Windows (2000, 2003 EE) DHCP service
Using the GUI DHCP admin tool

    * 1) Run the DHCP administration tool by clicking Start,
Administrative Tools, DHCP
    * 2) Click the + next to the server you want to add the options
to.
    * 3) Click on the Server Options folder
    * 4) Click the Action menu item, and then click Configure
Options...
    * 5) Make sure the General tab is the one you are working on.
    * 6) Scroll through the Available Options list
    * 7) Click on the check box next to 049 X Windows System Display
    * 8) Fill in the IP address field.
    * 9) Click the Add button to add the IP address to the list.
    * 10) Repeat steps 7 and 8 if you have a list of IP addresses
    * 11) Click on the check box next to 066 Boot Server Host Name.
    * 12) Fill in the String value field with a single IP address or a
hostname.
    * 13) Click the OK button to accept and apply both Options.
(from: http://blogs.sun.com/ThinkThin/entry/configuring_dhcp_options_49_and)

Et voila. Works.

Regards HaPe