One of the things I immediately liked after I installed Ubuntu 9.04 last year was the automatic enabling of CUPS printing with my desktop iMac, which has two attached USB printers. Today, I noticed that when I attempt to print wirelelessly from my netbook, the two defined printers are listed, but the Print button is grayed out. Using the Control Center Print tool, the printing troubleshooter returns: The CUPS printer on the server is not shared Also, if I click on the connect menu, I get: CUPS server error There was an error during the CUPS operation: 'httpConnectionEncrypt failed' This error remains unchanged regardless of whether the Encrypt box is checked. I notice that the printing utility shows the host IP of the print server as 10.0.1.3, while the MacOS Network utility identifies the wireless hub as 10.0.1.2. Changing the IP number has no effect on the problem. On the Mac side, printer sharing is enabled for both printers, and the firewall is set to allow all incoming connections. It looks like the CUPS problem is on the Mac side, but as yet I haven't found an answer. Any ideas?