Comment 14 for bug 57822

You are trying to use the printer on your router via the IPP mode of the router. It is possible that this mode is not 100% compatible with the CUPS backend. Does the router provide other access modes for the printer, like for example TCP/Socket (Hp JetDirect) or LPD? The easiest is probably to make it working via TCP/Socket. Look into the confioguration web interface of the router (http://192.168.1.1/ with a web browser) and activate the TCP/Socket and/or LPD protocol. Then try socket://192.168.1.1:9100 or lpd://192.168.1.1 as device URI for your CUPS print queue (If the router supports SNMP, possible URIs can be auto-detected by "/usr/lib/cups/backend-available/snmp 192.168.1.1"). Does this work?