# Knowledge Base Last Updated On: 13 Jul 2026 12 minutes read ## Agent Installation 1. [Agent Status Unavailable](https://www.manageengine.com/patch-management/help/device-onboarding/agent-status-unavailable.html) 2. [Fatal Error](https://www.manageengine.com/patch-management/help/device-onboarding/fatal-error.html) 3. [Agent Communication Failure](https://www.manageengine.com/patch-management/help/device-onboarding/agent-communication-failed.html) 4. [Agent Installation Issues](https://www.manageengine.com/patch-management/help/device-onboarding/troubleshoot-agent-installation-issues.html) 5. [Network Path Not found](https://www.manageengine.com/patch-management/help/device-onboarding/network-path-not-found.html) 6. [Access Denied](https://www.manageengine.com/patch-management/help/device-onboarding/access-denied.html) ## Patch Management 1. Patch Installation Failures: 1. [Patch Installation Failure - Access Denied](https://www.manageengine.com/patch-management/kb/patch-management/access-denied.html) 2. [Patch Installation Failure: Unknown Error Code: 2145124329](https://www.manageengine.com/patch-management/kb/patch-management/error-code-2145124329.html) 3. [Patch Installation Failure - Unknown Error Code: 2146498529](https://www.manageengine.com/patch-management/kb/patch-management/error-code-2146498529.html) 4. [Patch Installation Failure Error Code: 2145124343](https://www.manageengine.com/patch-management/kb/patch-management/patch-installation-failure-error-2145124343.html) 5. [Patch Installation Failure - "Fatal Error during Installation"](https://www.manageengine.com/patch-management/kb/patch-management/patch-installation-failure-fatal-error.html) 6. [Patch Installation Failure - "Data is invalid"](https://www.manageengine.com/patch-management/kb/patch-management/patch-installation-failure-invalid.html) 7. [Patch Installation Failure - Failure Remark: Unknown Error code: 2146498511](https://www.manageengine.com/patch-management/kb/patch-management/unknown-error-code-2146498511.html) 8. [Patch Installation Failure - Unknown Error Code: 2145124330](https://www.manageengine.com/patch-management/kb/patch-management/unknownerrorcode2145124330.html) 9. [Patch Installation Failure - Wait Operation Timed Out](https://www.manageengine.com/patch-management/kb/patch-management/wait-operation.html) 10. [Service Pack Installation Failure](https://www.manageengine.com/patch-management/kb/patch-management/service-pack-installation-failure.html) 11. [Patch deployment operation failed due to a signature verification failure on installer packages](https://www.manageengine.com/patch-management/kb/patch-management/signature-verification-failed.html) 12. [Windows Feature Pack Deployment Issues](https://www.manageengine.com/patch-management/kb/patch-management/windows-feature-pack-errors.html) 13. [Error Code: 50023 — Extended Security Updates (ESU) Deployment Failure](https://www.manageengine.com/patch-management/kb/patch-management/windows7-esu-50023.html) 14. [Failure Remark: Patch already Installed and the Changes will not be Effective until the System is Rebooted](https://www.manageengine.com/patch-management/kb/patch-management/patchalreadyinstalled.html) 15. [SQL Server - Patch Installation Failure](https://www.manageengine.com/patch-management/kb/patch-management/sql-patch-installation-failure.html) 16. [Reverting Changes - Patch Installation Failure](https://www.manageengine.com/patch-management/kb/patch-management/reverting-changes-patch-failure-configuring-windows-updates.html) 17. [Patch Deployment Failed - "File System Corrupted"](https://www.manageengine.com/patch-management/kb/patch-management/patch-deployment-failed-file-system-corrupted.html) 18. [Visual Studio Update Errors](https://www.manageengine.com/patch-management/kb/patch-management/visual-studio-update-errors.html) 19. [Troubleshooting Errors in Windows Updates](https://www.manageengine.com/patch-management/kb/patch-management/troubleshooting-errors-in-windows-updates.html) 20. [Patch Installation Failure - Error Code: 1073741819](https://www.manageengine.com/patch-management/kb/patch-management/error-code-1073741819.html) 21. [Patch Installation Failure - Error Code: 2359302](https://www.manageengine.com/patch-management/kb/patch-management/error-code-2359302.html) 22. [Patch Update Delayed Since Application is Used by Another Process](https://www.manageengine.com/patch-management/kb/patch-management/patch-update-delayed-since-application-is-used-by-another-process.html) 23. [Problem While Downloading the Patch from Server](https://www.manageengine.com/patch-management/kb/patch-management/problem-while-downloading-the-patch-from-server.html) 2. Patch Download Failures: 1. [Patch Download Failure: Proxy Error](https://www.manageengine.com/patch-management/kb/patch-management/proxy-error.html) 2. [Patch Download Failure: Common Cases](https://www.manageengine.com/patch-management/kb/patch-management/patch-download-failures.html) 3. [Patch Download Failure: Bug in Authorization handling](https://www.manageengine.com/patch-management/kb/patch-management/patch-db-bug-authorization.html) 4. [Patch Download Failure: Patch Store Location is not Available](https://www.manageengine.com/patch-management/kb/patch-management/patch-store-location-not-available.html) 5. [Troubleshooting Metadata and Patch Download Failure: Unable to connect to the vendor. Verify agent internet connectivity and proxy settings](https://www.manageengine.com/patch-management/kb/patch-management/troubleshooting-metadata-and-patch-download-failure.html) 6. [Patch Download Failure - "Checksum Failed"](https://www.manageengine.com/patch-management/kb/patch-management/patch-download-checksum-failed.html) 7. [Troubleshooting Package Manager Files Download Failure](https://www.manageengine.com/patch-management/kb/patch-management/troubleshooting-package-manager-files-download-failure.html) 8. [Absolute Secure Access Client Patch Download Failure](https://www.manageengine.com/patch-management/kb/patch-management/absolute-secure-client.html) 9. [Citrix HDX Realtime Media Engine Patch Download Failure](https://www.manageengine.com/patch-management/kb/patch-management/citrix-hdx-realtime-media-engine.html) 10. [Zoiper 5 Patch Download Failure](https://www.manageengine.com/patch-management/kb/patch-management/zoiper-5.html) 11. [Tortoise Git Patch Download Failure](https://www.manageengine.com/patch-management/kb/patch-management/tortoise-git.html) 12. [Citrus Secure Access Endpoint Analysis Patch Download Failure](https://www.manageengine.com/patch-management/kb/patch-management/citrus-secure-access-endpoint-analysis-patch-download-failure.html) 13. [FortiClient VPN Patch Download Failure](https://www.manageengine.com/patch-management/kb/patch-management/forticlient-vpn-patch-download-failure.html) 14. [Meeting Owl Uninstaller Patch Download Failure](https://www.manageengine.com/patch-management/kb/patch-management/meeting-owl-uninstaller-patch-download-failure.html) 15. [Microsoft Visual Studio Patch Download Failure](https://www.manageengine.com/patch-management/kb/patch-management/microsoft-visual-studio-patch-download-failure.html) 3. Office Specific Failures: 1. [Troubleshooting Microsoft 365 and Office Patching](https://www.manageengine.com/patch-management/kb/patch-management/office-issues.html) 2. [Office Patch Download Failure](https://www.manageengine.com/patch-management/kb/patch-management/office-patch-download-failure.html) 3. [Office Patch Download Failure - Proxy Issues](https://www.manageengine.com/patch-management/kb/patch-management/office-patch-download-whitelisting.html) 4. [Office Patch Download Failure - Extraction Issue in Patch Store](https://www.manageengine.com/patch-management/kb/patch-management/office-patch-extraction-issue.html) 5. [Office Update Error in Patch Installation](https://www.manageengine.com/patch-management/kb/patch-management/patch-installation-office.html) 6. [Office Patch Installation Failure](https://www.manageengine.com/patch-management/kb/patch-management/microsoft-365-patch-troubleshooting.html) 4. Patch Scan and Sync Failures: 1. [Patch Scan Failed](https://www.manageengine.com/patch-management/kb/patch-management/patch-scan-failed.html) 2. [Manual Patch Scan Failure: Scanning Timed Out](https://www.manageengine.com/patch-management/kb/patch-management/manual-scan-timed-out.html) 3. [Failed to download required scan files (Problem in generating Patch Scan data)](https://www.manageengine.com/patch-management/kb/patch-management/problem-in-generating-patch-scan-data.html) 4. [Patch DB Sync Failure — Closed Network](https://www.manageengine.com/patch-management/kb/patch-management/closed-network-patch-db-failure.html) 5. [Patch DB Sync Failure — Proxy/Open Network](https://www.manageengine.com/patch-management/kb/patch-management/open-network-db-sync-failure.html) 6. [Offline Metadata Sync Failed Due To APTPKG Not Found](https://www.manageengine.com/patch-management/kb/patch-management/offline-meta-sync-failed-due-to-aptpkg-not-found.html) 7. [Offline Meta Sync Failed Due To Command Module Is Not Found](https://www.manageengine.com/patch-management/kb/patch-management/offline-meta-sync-failed-due-to-commandnotfound.html) 8. [Offline Meta Sync Failed Due To Glib Error](https://www.manageengine.com/patch-management/kb/patch-management/offline-meta-sync-failed-due-to-glib-error.html) 9. [Patch scan/deployment operation failed due to the inability to create a repository configuration file](https://www.manageengine.com/patch-management/kb/patch-management/dcrepolist-manager-operation-failed.html) 10. [Patch scan/deployment operation failed because DPKG is in use](https://www.manageengine.com/patch-management/kb/patch-management/debian-dpkg-already-running.html) 11. [Patch scan/deployment operation failed due to loading failure of yum.conf](https://www.manageengine.com/patch-management/kb/patch-management/failed-to-parse-yum-file.html) 5. Linux Issues: 1. Package Manager Execution Failures: 1. [Linux package manager failed to execute due to a symbol lookup failure](https://www.manageengine.com/patch-management/kb/patch-management/execution-failed-with-zypper.html) 2. [Linux package manager failed to execute due to an SSL certificate loading failure](https://www.manageengine.com/patch-management/kb/patch-management/package-manager-execution-failed-due-to-pem-client-certificate.html) 3. [Linux package manager failed to execute due to a corrupted RPM database](https://www.manageengine.com/patch-management/kb/patch-management/package-manager-failed-due-to-rpmdb-corruption.html) 4. [Linux package manager failed to execute due to a corrupted DPKG database](https://www.manageengine.com/patch-management/kb/patch-management/dpkg-interrupted.html) 5. [RPM and Yumm Commands Error: Linux package manager failed to execute due to an NSS library initialization failure](https://www.manageengine.com/patch-management/kb/patch-management/rpm-and-yum-commands-error.html) 6. [Linux package manager failed to execute due to a 'KeyboardInterrupt' exception](https://www.manageengine.com/patch-management/kb/patch-management/package-manager-encountered-exception.html) 7. [Linux package manager failed to open /var/log/hawkey.log](https://www.manageengine.com/patch-management/kb/patch-management/package-manager-failed-to-open-hawkey-log.html) 8. [APT engine is corrupted](https://www.manageengine.com/patch-management/kb/patch-management/fix-apt-engine-corruption.html) 9. [Cannot proceed with scan/deployment since Yum is already running](https://www.manageengine.com/patch-management/kb/patch-management/redhat-yum-already-running.html) 10. [SUSE Zypper Already Running](https://www.manageengine.com/patch-management/kb/patch-management/suse-zypper-already-running.html) 2. Repo / Registration Issues: 1. [Required Red Hat repository information is not available in any repository file](https://www.manageengine.com/patch-management/kb/patch-management/invalid-redhat-repo-found-in-agent-machine.html) 2. [Repo Files Lacks URL Pointing to RedHat Repository](https://www.manageengine.com/patch-management/kb/patch-management/repo-file-lacks-url-pointing-to-redhat-repository.html) 3. [Issues found in the RedHat nominated system while creating cache repository](https://www.manageengine.com/patch-management/kb/patch-management/red-hat-system-nomination-issues.html) 4. [Linux package manager failed to install RHN-related packages because the vendor has marked them as obsolete](https://www.manageengine.com/patch-management/kb/patch-management/rhn-package-failed.html) 5. [Inactive RedHat Subscription](https://www.manageengine.com/patch-management/kb/patch-management/inactive_redhat_subscription.html) 6. [Invalid SUSE Registration Code](https://www.manageengine.com/patch-management/kb/patch-management/invalid-suse-registration-code.html) 7. [System Missing an Active SUSE Subscription](https://www.manageengine.com/patch-management/kb/patch-management/system-is-missing-an-active-suse-subscription.html) 8. [Unable to Find Valid SUSE Repo](https://www.manageengine.com/patch-management/kb/patch-management/unable-to-find-valid-suse-repos.html) 9. [Troubleshooting Linux Repo Management Tool Errors](https://www.manageengine.com/patch-management/kb/patch-management/troubleshooting-linux-repo-management-tool-errors.html) 3. Certificate / Trust Issues: 1. [Package Manager Execution Failed Due to PEER Certificate Unauthentication](https://www.manageengine.com/patch-management/kb/patch-management/package-manager-execution-failed-due-to-peer-certificate-unauthentication.html) 2. [Update database failure - Invalid Certificate](https://www.manageengine.com/patch-management/kb/patch-management/updatedb-invalid-certificate.html) 3. [Red Hat Certificate Upload Issues: Linux package manager metadata files are not available because the Red Hat certificates are invalid](https://www.manageengine.com/patch-management/kb/patch-management/redhat-certificate-upload-issues.html) 4. Other Linux Repository/Config Issues: 1. [Upgrading Yum Version](https://www.manageengine.com/patch-management/kb/patch-management/upgrade-yum-version.html) 6. Disk Space Issues: 1. [Patch Scan/Deployment Operation Failed Due To No Space Left In The /var/tmp Directory](https://www.manageengine.com/patch-management/kb/patch-management/insufficient-space-in-tmp-directory.html) 2. [Patch deployment operation failed due to no space left in the /usr directory](https://www.manageengine.com/patch-management/kb/patch-management/insufficient-space-in-usr-filesystem.html) 3. [Patch scan/deployment operation failed due to no space left in the /var directory](https://www.manageengine.com/patch-management/kb/patch-management/insufficient-space-in-var-partition.html) 4. [Patch scan/deployment operation failed because there is no space left on the endpoint](https://www.manageengine.com/patch-management/kb/patch-management/process-failed-due-to-insufficient-space.html) 5. [Vulnerability DB Update Failed due to Insufficient Disk Space](https://www.manageengine.com/patch-management/kb/patch-management/vulnerability-db-update-failed.html) 7. Configuration / State Issues: 1. [Configuration Status - Ready to Execute](https://www.manageengine.com/patch-management/kb/patch-management/configuration-status-ready-to-execute.html) 2. [Configuration Status - Yet to Apply](https://www.manageengine.com/patch-management/kb/patch-management/configuration-status-yet-to-apply.html) 3. [Automatic Patch Download / Deployment Not Started](https://www.manageengine.com/patch-management/kb/patch-management/patch-download-not-started.html) 4. [Patch Configuration Failure - "Draft Download Failed"](https://www.manageengine.com/patch-management/kb/patch-management/draft-download-failed.html) 8. Miscellaneous / Operational Failures: 1. [Troubleshooting Patch Issues](https://www.manageengine.com/patch-management/kb/patch-management/patch-issues.html) 2. [Patch Upload Failed: Checksum Mismatch](https://www.manageengine.com/patch-management/kb/patch-management/patch-upload-failed-due-to-checksum-mismatch.html) 3. [Finding the Task That Causes Reboot or Reboot Prompt](https://www.manageengine.com/patch-management/kb/patch-management/reboot.html) 4. [Unable to upload files from the Nominated System (NS) to the Central Server](https://www.manageengine.com/patch-management/kb/patch-management/redhat-file-upload-to-server-failure.html) 5. [Update database failure - Data Corruption](https://www.manageengine.com/patch-management/kb/patch-management/updatedb-data-corruption.html) 6. [Execution Status Fix](https://www.manageengine.com/patch-management/kb/patch-management/execution_status_fix.html) ## Security Management 1. [SSL Error](https://www.manageengine.com/patch-management/help/server/ssl-troubleshoot.html) 2. [Encrypted key file uploaded](https://www.manageengine.com/patch-management/help/server-security/uploaded-key-file-encrypted.html) ## Scope of Management 1. [Unable to add devices](https://www.manageengine.com/patch-management/help/device-onboarding/unable-to-add-device.html) ## User Management 1. [SAML authentication error codes](https://www.manageengine.com/patch-management/help/access-management/saml-authentication-error-codes.html) 2. [Google Authenticator Failure](https://www.manageengine.com/patch-management/help/access-management/google-authenticator-failure.html)