Please could someone help this is so frustrating! I have a Macbook Pro, and an iMac both on the same network - both with wireless connections to a Linksys wireless router. On each computer, I see the other one in Finder under the "Shared" category on the LHS of finder. However, when I try and connect to the computer, I get "Connection failed - the server Mac 24 Home may not exist or it is unavailable at this time Check the server ip ... etc. etc. This means that I cannot print from my Macbook Pro to the printer that's attached to the iMac. If I reboot the iMac, my Macbook can print to its printer for a while - and then eventually after 20 minutes or so it cannot print anymore - and cannot connect to any shared folders on the iMac. The computers are both awake - not suspended and both with virtually no CPU usage. I don't have any type of firewall running on either. Any help would be greatly appreciated. UPDATE I've done a bit of troubleshooting - what I have found is that after about 20 minutes, my iMac loses all network connectivity. Even though the wireless signal is full strengh (yes, connected wirelessly), I cannot browse anything - cannot even ping the ip address of the router it is wirelessly connected to! I find that if I then switch off the wireless connection, then connect again to the network - then all is well again for about 15 or 20 minutes or so, until I have to repeat the whole thing again.