Document Windows KB5074109 RDP authentication issue#1058
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Document Windows KB5074109 RDP authentication issue#1058
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… RDP auth error issue #1056 Co-authored-by: VShawn <10143738+VShawn@users.noreply.github.com>
Co-authored-by: VShawn <10143738+VShawn@users.noreply.github.com>
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[WIP] Investigate changes causing RDP authentication error code 0x80080005
Document Windows KB5074109 RDP authentication issue
Jan 22, 2026
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Context
Issue #1056 reports RDP authentication error
0x80080005after Windows update. Users reported v1.2.1 worked while newer versions failed.Investigation Results
Analyzed 71 commits (v1.2.0 → HEAD), reviewed 18 RDP-specific changes. Finding: No authentication code changes. CredSSP configuration unchanged since 2022 .NET 6 migration.
Root cause: Windows Update KB5074109 broke CredSSP authentication system-wide, affecting all RDP applications. Microsoft released KB5077744 (out-of-band) to fix.
Changes
Documentation Added
INVESTIGATION_ISSUE_1056.md- Technical analysis: code review methodology, commit-by-commit findings, CredSSP examinationTROUBLESHOOTING_RDP_AUTH_ERROR.md- User guide: KB5077744 installation steps, workarounds, verificationTROUBLESHOOTING_RDP_AUTH_ERROR_ZH.md- Chinese translationISSUE_1056_SUMMARY.md- Executive summaryreadme.md- Added troubleshooting section with bilingual linksUser Action
Install Windows Update KB5077744 from Microsoft Update Catalog. This is an OOB update that won't appear automatically in Windows Update.
References
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