Another reason to not expose your QNAP to the Internet

[PenkethBoy 2068]

https://www.qnap.com/en/security-advisory/QSA-20-09

Mainly for info - but considering some of the bugs introduced recently with firmware upgrades ensure you have adequate backup of you config etc

Also unless you are experienced in securing systems against attack dont expose you QNAP NAS to the internet - they are not secure and hardened for this task - no matter what QNAP may say.