Known update issues

Windows 11 KB5079473: IPP-over-USB multifunction printers lose scan or fax

OpenKnown issueCommunity reportCheck scriptUpdated 2 Nov 2026

Community report – not yet confirmed by the vendor: users or trade media report on it (forums, Q&A sites, Reddit, web research), but the vendor has not confirmed the issue (yet). Use this information with caution.

Summary

After KB5079473, the scan or fax function of USB multifunction printers that use IPP-over-USB (Internet Printing Protocol over USB) is reported to stop working. This is reported by users, not yet confirmed by the vendor. Only one report from a single source is known, and it is described as unresolved.

Symptoms

The scanner or fax part of a USB multifunction printer is shown as disconnected.
Installing third-party drivers fails.
Some printers print raw text such as "POST /ipp/print" instead of the document.

Affected

Windows 11 with KB5079473 or later
USB multifunction printers using IPP-over-USB
Exact printer models are not named in the source

Workaround

No workaround known.

Fix

Not fixed yet.

Recommendation

Before rolling out KB5079473 widely, test it on a pilot PC with your USB multifunction printers, including scan and fax. If affected, report it to Microsoft and the printer vendor, and check for updated printer drivers or firmware. Treat this report with caution until it is confirmed by further sources.

Check script: am I affected? (PowerShell, read-only)

Check: Windows 11 KB5079473: IPP-over-USB multifunction printers lose scan or fax

What it checks: Checks whether the update named in the community reports is installed on this device. It changes nothing, writes no file and needs no internet.
What to do if affected: Compare the symptoms with the entry; watch for a statement from the vendor before changing anything.

Community report: not yet confirmed by the vendor. The check is based only on the details of the reports (e.g. the update named) and is an indication, not proof.

Result and exit code: AFFECTED = 5, NOT AFFECTED = 0, FIXED – solution installed = 0, UNCLEAR = 6, error = 1 (as an Intune detection script: 1 = affected, otherwise 0).

What exactly happens?

Only reads – changes nothing, writes no file, needs no internet and asks no questions.
Checks: update KB5079473 installed
Reports the result with one line per condition and the next step.

What is checked

Indication of being affected: update KB5079473 installed

How to use the script – step by step

Download: on the entry page, read the terms and conditions (section "Free scripts") and the disclaimer, tick "I accept" and click "Download script". The file is saved in your "Downloads" folder.
Open PowerShell: press the Start key, type "PowerShell", press Enter. No administrator rights are needed – only if the result reports conditions as "not checkable", open PowerShell as administrator (right-click "Windows PowerShell" › "Run as administrator").
Change to the Downloads folder (type or paste the command, then press Enter):
```
cd "$env:USERPROFILE\Downloads"
```
Compare the checksum: the command shows a long string. It must be exactly the same as "SHA-256" on the entry page (F23A77924FDEC129CC88CA98CC51F595908654AC79EDB9CA807FFA1CF6564796). If it differs, delete the file and do not run it.
```
(Get-FileHash .\ITSB-Check-ipp-over-usb-multifunction-printers-lose-scan-or-fax-after-k-v1.ps1 -Algorithm SHA256).Hash
```
Unblock the file (Windows marks downloaded files). Alternatively in Explorer: right-click the file › Properties › tick "Unblock" at the bottom › OK.
```
Unblock-File .\ITSB-Check-ipp-over-usb-multifunction-printers-lose-scan-or-fax-after-k-v1.ps1
```
Allow scripts for this PowerShell window only. This only applies until you close the window – the computer's setting stays unchanged. If PowerShell asks, confirm with "Y".
```
Set-ExecutionPolicy -Scope Process -ExecutionPolicy Bypass
```
Run the script. It only checks: it changes nothing, writes no file and needs no internet.
```
.\ITSB-Check-ipp-over-usb-multifunction-printers-lose-scan-or-fax-after-k-v1.ps1
```
Read the result (at the bottom): "AFFECTED" – follow the steps under "what to do" (e.g. install the update or use the entry's fix script). "NOT AFFECTED" – nothing to do. "FIXED – solution installed" – nothing to do; you can undo a workaround you applied earlier. "UNCLEAR" – not everything could be checked: compare the details in the entry manually.
Download without a browser (RMM, software distribution): the address needs "&agb=1". This means the person deploying the script accepts the terms and conditions (section "Free scripts") and the disclaimer on behalf of their organisation.
```
Invoke-WebRequest "https://www.it-sb.ch/ki-api/?a=dl&f=ITSB-Check-ipp-over-usb-multifunction-printers-lose-scan-or-fax-after-k-v1.ps1&agb=1" -OutFile ".\ITSB-Check-ipp-over-usb-multifunction-printers-lose-scan-or-fax-after-k-v1.ps1"
```
For many devices (RMM, scheduled task): command below, exit codes 0 = not affected or fixed, 5 = affected, 6 = unclear, 1 = error. Upload it as the detection script of an Intune remediation ("Run script in 64-bit PowerShell" = Yes): there it automatically reports 1 = affected, otherwise 0 (manually with -Intune).
```
powershell.exe -NoProfile -ExecutionPolicy Bypass -File .\ITSB-Check-ipp-over-usb-multifunction-printers-lose-scan-or-fax-after-k-v1.ps1
```
```
powershell.exe -NoProfile -ExecutionPolicy Bypass -File .\ITSB-Check-ipp-over-usb-multifunction-printers-lose-scan-or-fax-after-k-v1.ps1 -Intune
```

File: ITSB-Check-ipp-over-usb-multifunction-printers-lose-scan-or-fax-after-k-v1.ps1 · no administrator rights needed
Version: 1 · Date 2 Nov 2026 · 25 KB
SHA-256: F23A77924FDEC129CC88CA98CC51F595908654AC79EDB9CA807FFA1CF6564796
Downloads: 0

Use at your own risk – no warranty, no liability if anything does not work or is wrong. Test before use and make a backup. Our terms and conditions (free scripts) apply. Generated automatically from the vendor’s statement and checked (rules, second AI review).

Download without a browser (RMM, software distribution): address with "&agb=1" – this means the person deploying the script accepts the terms on behalf of their organisation: https://www.it-sb.ch/ki-api/?a=dl&f=ITSB-Check-ipp-over-usb-multifunction-printers-lose-scan-or-fax-after-k-v1.ps1&agb=1

Reports from the community and trade media

Reports from forums, Q&A sites, Reddit and trade media – linked only, without the names of the authors; the vendor’s statement is authoritative.

Legacy USB printer stopped working after Windows 11 update News · helpdeskgeek.com, 2 Nov 2026

Sources

Legacy USB printer stopped working after Windows 11 update News · helpdeskgeek.com

Compiled from community reports and web research and translated with AI (Claude) – not yet confirmed by the vendor. The vendor’s statements are authoritative. Updated 2 Nov 2026, 06:28.

Where the information comes from

We continuously read the vendors’ official sources, community reports and trade media and summarise them in our own words, with a link to the source:

Microsoft: Windows release health (Windows 10/11, Server 2016 to 2025), Windows message center, known issues of Microsoft 365 Apps (Outlook, Excel, Word, PowerPoint), Edge, Intune, Autopilot, Windows 365 and Entra Connect, Microsoft KB articles with timelines, Exchange and Windows IT Pro blogs, optionally Microsoft 365 service health and message center
other vendors: Veeam KB, Citrix (known issues), Ubuntu and Debian (regressions), Broadcom (VMware), Fortinet, Cisco, Mozilla, Let’s Encrypt
community (title, short excerpt and link only, without the names of the authors): Microsoft Q&A, Microsoft Tech Community (discussions), Veeam R&D Forums, Eleven Forum
targeted web research with AI (Claude), e.g. on the updates of the month – this also finds discussions on Reddit and in forums; such entries are labelled as community reports until the vendor confirms them
early warning from trade media (title and link only): Born’s Tech and Windows World, BleepingComputer, AskWoody, Windows Latest, Windows Central, gHacks, The Windows Club, Deskmodder, Dr. Windows, WindowsArea, Frankys Web, heise online

Summary and translation with AI (Claude by Anthropic) – without any data of visitors.

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