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Windows Server 2019 Windows Server 2019 Out-of-band update
Out-of-band

KB5077795

KB5077795: Cumulative update for Windows Server, version 2019, January 2026. Remote Desktop sign-in failures fixed

In short

Fixes sign-in failures during Remote Desktop connections, including with the Windows App. It also includes servicing stack improvements.

Does it affect you? Applies to: Devices running Windows Server 2019, x64.

Build
17763.8280
Restart
Required
Review notes Additional details from the official release notes (1) Read note
  • Known issues KB5078131 addresses the issue where some apps become unresponsive or show errors when opening or saving files in cloud-based storage.

The official sources are linked at the end of the page.

Microsoft publishes separate notes for this KB for Windows 10.

What changes

Fix 1 change

Remote Desktop

For: Remote Desktop users

  • Some users can sign in again during Remote Desktop connections.1
    Fixes authentication-step failures across different Remote Desktop applications on Windows, including the Windows App.

Improvement 1 change

Servicing stack

  • The component that installs Windows updates gets quality improvements intended to improve the reliability of update installation.2
    Includes servicing stack update KB5074222, build 17763.8260.

Known issues

  1. Resolved Affects: Everyone Resolved by KB5082123

    Japanese characters fail to render correctly in PowerShell

    After installing this update or a later update released from January 13, 2026, Japanese-language installations of Windows Server 2019 might display garbled Japanese characters in PowerShell. KB5082123 resolves this issue.3

    Resolution Fixed in KB5082123

    Install KB5082123 (or a later cumulative update) on affected devices. No manual workaround is required after updating.

  2. Resolved Affects: Everyone Resolved by KB5075904

    Some devices with Virtual Secure Mode enabled might fail to shut down or hibernate

    Some Secure Launch-capable PCs with Virtual Secure Mode enabled might fail to shut down or hibernate and restart instead. KB5075904 addresses this issue.4

    Resolution Fixed in KB5075904

    Install KB5075904 (or a later cumulative update) on affected devices. No manual workaround is required after updating.

  3. Open Affects: Everyone

    Apps might become unresponsive when saving files to cloud-based storage

    Some apps might become unresponsive or show errors when opening files from or saving files to cloud storage such as OneDrive or Dropbox. In some Outlook setups with PST files on OneDrive, Outlook might hang and fail to reopen; sent items might be missing or downloaded emails might be downloaded again. The issue remains listed as open.5

    Workaround status No workaround yet

    Microsoft has not published a manual workaround for this issue yet. Monitor release health until a resolving update is available.

Technical details

Data sheet · Security · Downloads · Components Click to collapse or expand

Data sheet

Released
2026-01-17
Classification
Updates
Type
Cumulative update
Restart
Required
Replaces
KB5073723, KB5074975, KB5071544, KB5068791
+13 earlier KB5070883, KB5066586, KB5065428, KB5066187, KB5063877, KB5062557, KB5060531, KB5061978, KB5058392, KB5059091, KB5058922, KB5050008, KB5037425
Replaced by
KB5078131
VersionBuildChannel
2019 17763.8280 General availability

Security

No vulnerabilities are listed for this update.

Downloads (Microsoft Update Catalog)

x64 2019
716.2 MB
windows10.0-kb5077795-x64.msu Main update · KB5077795 SHA-1: 0b0bc884…28008a

Updated components

100 files changed since the previous update for the same versions.

Top changed componentsFiles
Hyper-V and virtualization2
Audio1
Kernel1
Secure Boot1

Sources

Updated
Cited passages from Microsoft's official notes (5)
  1. 1. Fixed: Some users experienced sign-in failures during Remote Desktop connections. This issue affected authentication steps for different Remote Desktop applications on Windows such as the Windows App. support.microsoft.com
  2. 2. This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. support.microsoft.com
  3. 3. This issue is resolved in Windows updates released on and after April 14, 2026 (such as KB5082123). support.microsoft.com
  4. 4. This issue is addressed in KB5075904. support.microsoft.com
  5. 5. After installing this update, some applications may become unresponsive or encounter unexpected errors when opening files from or saving files to cloud-based storage, such as OneDrive or Dropbox. support.microsoft.com
Checked automatically: 8 of 8 checks passed, 5 quoted passages · compared with Microsoft's page on Sep 25, 2026
  • Quotes found in the official pages: passed
  • Numbers found in the sources: passed
  • Vulnerabilities from the dossier only: passed
  • Links to allowed domains only: passed
  • Every official change covered: passed
  • Readable plain text: passed
  • Changes confirmed by the file list: passed
  • Sources agree: passed

A second AI read the text against the sources: correctness 4/5, clarity 4/5, completeness 4/5. How we work

Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake