Important Notes

• For the status of QTS updates and maintenance for your NAS model, visit https://www.qnap.com/en/product/eol.php
• To learn more about NAS models that support the TL-D800C, TL-R1200C-RP, TL-D400S, TL-D800S, TL-D1600S, TL-R400S, TL-R1200S-RP, see the Compatibility List at https://www.qnap.com/en/compatibility-expansion
• We have fixed the vulnerabilities in the following apps to ensure your data security: Surveillance Station, QVPN Service, Qfiling, Qsync Central, QcalAgent, and IFTTT Agent. To continue using these apps, go to the App Center and update them to the latest version.
• For more information on the kernel versions for NAS models that QTS 4.5.1 supports, see https://www.qnap.com/en/release-note/kernel
• Removed the following applications from App Center due to PHP 7 updates in QTS 4.4.1: "phpEasyProject", "Dolphin", "CMS Made Simple", "Vtiger CRM", "iStat", "PostgreSQL 9.3.13.3", and "ownCloud".
• Due to compatibility issues, the following applications have been removed from the App Center in QTS 4.4.1: FileFlex, MantisBT, SugarCRM, Xeams, DokuWiki, and Azure Storage.
• Once you update QTS to 4.4.1 (or later) on the TS-1635AX, you will not be able to downgrade QTS to versions earlier than 4.4.1.
• Removed support for Plex Home Theater from HybridDesk Station.
• After reaching their end of support in July 2020, Notes Station and Qnotes have been removed from QTS App Center, Google Play, and Apple App Store. We recommend using Notes Station 3 and Qnotes 3 to benefit from the next-generation note-taking features. For details on how to transfer your notes from Notes Station 2 to Notes Station 3, see the following tutorial: https://www.qnap.com/en/how-to/tutorial/article/importing-notes-from-notes-station-2-to-notes-station-3
• Removed HappyGet from the App Center due to changes in Google extension policies.
• vQTS does not support updating to 4.5.1 and later versions. QNAP will only release security updates for vQTS. We recommend using QuTScloud as an alternative virtual NAS solution. For details, go to https://www.qnap.com/solution/qutscloud-hypervisor
• Starting from 4.5.1, QTS is no longer compatible with the following applications: DJ2 Console, CodexPack.

Fixed Issues

• After a system update to QTS 4.5.1, users could not run applications that lacked digital signatures.
• App Center would still install applications that lacked digital signatures even if users did not allow such an installation in the App Center settings.
• System Event Log would erroneously report the failure of a non-existent power supply unit on certain expansion enclosures.
• The number of Python processes would increase abnormally after users changed the system port number, causing OOM (out of memory) issues.
• Users could not specify a destination for log retention if all volumes were encrypted.
• App Center could not enable WirelessAP Station.
• Fixed a command injection vulnerability (CVE-2020-2508).
• Upon every user login, QTS would display a message to remind users to configure password retrieval settings.

Known Issues

• QTS displays an inaccurate warning message about the failure to enable Media Streaming Add-on after system update from 4.4.3 to 4.5.1. To work around this issue, you only need to manually enable the add-on in the App Center.
• Users cannot add NAS models running QTS 4.5.1 to vSphere Client (HTML5).
• Users cannot add NAS models running QTS 4.5.1 to Snapshot Agent.
• App Center cannot enable Mustang Card User Driver after a system update from QTS 4.4.3 to QTS 4.5.1.
• Users cannot install OpenVINO Workflow Consolidation Tool (OWCT) in the App Center.