Hand your Linux client the -bgr233 switch and see if it works. Not sure about the Netscape thing. I'll take a look the next chance I get my hands on a Linux Netscape. What version are you running? Oh, and does the Java Console say anything useful? (I didn't write the Java client at all. I just got the Java client source from the VNC folks and hacked in defaulting to BGR233 and hacked out the password screen.)