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IPP Protocol Print Job Failed — Internet Printing Protocol Connection Errors

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Overview

Fix IPP (Internet Printing Protocol) print job failures including connection refused, authentication required, and unsupported operation errors.

Key Details

  • 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

Common Causes

  • 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

Steps

  1. 1Verify the printer supports IPP: check printer settings or documentation for IPP/AirPrint support
  2. 2Test connectivity: 'ipptool -tv ipp://printer-ip/ipp/print get-printer-attributes.test'
  3. 3Check the IPP URI format: ipp://hostname:631/ipp/print or ipps://hostname:443/ipp/print for encrypted
  4. 4Ensure port 631 is not blocked: 'nc -zv printer-ip 631'
  5. 5Try the raw socket alternative if IPP fails: add the printer using socket://printer-ip:9100

Tags

ippprotocolnetwork-printingport-631driverless

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Frequently Asked Questions

IPP is a full protocol with job control, status queries, and authentication. Raw socket (port 9100) just sends data directly to the printer with no feedback. IPP is preferred for its features; raw socket is a fallback for basic connectivity.