Right now I have a CentOS 5 cups server, which runs cups 1.3.7 and the Ubuntu 12.10 users can't print to it because tehy use cups 1.6.
According to this bug, it is a regression in cups 1.6.
Trying with CentOS 6 which have cups 1.4.2 it tries to connect for 30 seconds and then fails. Ubuntu 12.04 LTS server have cups 1.4.3, so I don't suppose that would make any difference, as the bug mentions it works with cups 1.5.7.
What is the recommended solution to enable cups 1.6 clients to be able to print on a cups server?