Everything looks fine with your config. I guess this is server issue. If you can, please add server's cupsd.conf. And add server's and client's error_log and server's acces_log when printing fails.
Thanks.
btw IPP *is* HTTP and I'm still suspecting this is configuration issue, since HTTP and IPP protocols are well tested in all networks (Windows, OSX, CUPS1.1, CUPS1.2).
Everything looks fine with your config. I guess this is server issue. If you can, please add server's cupsd.conf. And add server's and client's error_log and server's acces_log when printing fails.
Thanks.
btw IPP *is* HTTP and I'm still suspecting this is configuration issue, since HTTP and IPP protocols are well tested in all networks (Windows, OSX, CUPS1.1, CUPS1.2).