IPP Protocol Print Job Failed — Internet Printing Protocol Connection Errors

Fix IPP (Internet Printing Protocol) print job failures including connection refused, authentication required, and unsupported operation errors. This guide covers everything you need to know about this topic, including common causes, step-by-step solutions, and answers to frequently asked questions.

Here are the key things to understand: IPP (Internet Printing Protocol) is the modern standard for network printing, replacing LPD and raw socket. IPP uses HTTP/HTTPS on port 631 by default for printer communication. Most modern printers support IPP natively — it is the default protocol for CUPS and AirPrint. IPP supports authentication, encryption, job status queries, and printer capability discovery. IPP Everywhere allows driverless printing on printers that support the standard. Understanding these fundamentals will help you diagnose and resolve this issue more effectively.

The most common reasons this occurs include: Printer's IPP service not enabled or listening on the expected port. Firewall blocking port 631 between the computer and the printer. IPP URI incorrect — wrong hostname, port, or print queue path. Printer requires authentication but credentials are not configured on the client. Identifying the root cause is the first step toward finding the right solution.

To resolve this, follow these recommended steps: Verify the printer supports IPP: check printer settings or documentation for IPP/AirPrint support. Test connectivity: 'ipptool -tv ipp://printer-ip/ipp/print get-printer-attributes.test'. Check the IPP URI format: ipp://hostname:631/ipp/print or ipps://hostname:443/ipp/print for encrypted. Ensure port 631 is not blocked: 'nc -zv printer-ip 631'. Try the raw socket alternative if IPP fails: add the printer using socket://printer-ip:9100. If these steps do not resolve the issue, consider consulting additional resources or a qualified professional.

This article is part of our Printer Error Codes collection on Error Codes Wiki. We provide comprehensive, up-to-date information to help you find solutions quickly.