Can no longer connect to other computer (server)

Hi,
I have developed a problem this weekend, and can't seem to resolve it. I am connected to the internet via Linksys router (WAG54G) and since the wireless signal with my iMac has always been a bit suspect, the iMac is connected to the router via ethernet cable. My G4 Powerbook has always connected wirelessly, without a problem.
Currently, I can get both computers on the internet, no problem. I cannot, however, get them to talk to each other. On the Powerbook I get the message that the G5iMac "alias" is not available (and it will not allow me to delete this alias either, although I am the adminstrator). On the iMac I get the message that the "server is not available". Same thing happens if I type in TCP/IP address as if I select "Go Network".
I have repaired permissions, I have deleted com.apple.networkconfig.plist - nothing works. I don't understand what has changed, but how do I fix it? Any ideas?
Thanks,
Jim
iMac G5   Mac OS X (10.4.6)  

Hi Jim,
Your issue is the most FAQ in the forums, it is an ongoing problem with Tiger waiting to be fixed by Apple. Till then, forget your aliases and use either Command-K or from the Finder Go-->Connect to Server and enter the remote Mac's IP address to connect.
Also, Open Utilities-->Terminal and type lookupd -flushcache (Press Return) and reboot. Do this for both macs.
Macs running 9.x, Macs running 10.4.x, SGI workstations running Irix 6.5.x

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