I got what may perhaps be a similar message. When I clicked "OK", I was reverted back to login screen (perhaps cde).

I had previously disconnected the hme0 interface from my dhcp provider and attached it to another router which was supplying dhcp information.

I had however, before doing any of these steps, edited /etc/default/dhcpagent
and removed the "12' from:
PARAM_REQUEST_LIST=1,3,6,15,28,43

So that a hostname may not, by agent, via dhcp server be requested.

Setting hostnames for a system connected to a dhcp server is documented elsewhere - a google search may reveal that.

In spite of my doing the edit in the /etc/default/dhcpagent and as i believe(I'm pretty sure I rebooted), rebooting after doing such edit (this requires a reboot, see dhcpagent man page)
"
For IPv4, the dhcpagent daemon can be configured to request
a particular host name. See the REQUEST_HOSTNAME description
in the FILES section. When first configuring a client to
request a host name, you must perform the following steps as
root to ensure that the full DHCP negotiation takes place:

# pkill dhcpagent
# rm /etc/dhcp/interface.dhc
# reboot
"

I got the message, believing this to be caused by the dhcp server change, I logged in via "command line login" and, I, did, a reboot...

I did not have the issue when the system rebooted and, I was, via, perhaps, CDE, login.

Another system was also moved from one dhcp server to another in a similar manner, however, the login interface on that was, perhaps, Sun's Java...and on that system, I did not, have, the same issue...