Host name bad

Hi:

After I installed Red Hat 7.1, I hooked up my HP deskjet. I ran the
usual test pages and all was well.

This past week I picked up a SohoWare BroadGuard Router. After
installing the router though I have found that when I went to print a
web site page I got the following Netscape [4.76] error:

    Get_local_host: hostname 'gonzo' bad

I do not know where to start looking or even what to look for to
correct this.

Where do I start?

Thanks,

Mike