Let me add my voice to the chorus. This is most frustrating. G3 and
G4 iBooks @10.3.9 will sometimes login to the Panther Server (LDAP)
but mostly not. I've checked my Directory Access settings, turned
off all wireless security, selected the specific wireless network,
restarted the laptop, switched to static IP, tried different Base
Stations, tried the fix suggested below, all to no avail.
Are those iBooks set to use DHCP ? If so, try it with one that isn't.