I have recently installed the new update to QTS 4.3.5 on my TS-251A. Now I cannot access the QTS web interface anymore. Whenever I try to (using HTTPS and the static LAN IP of the NAS), my browser tells me that the certificate is invalid. Although the browser offers to "continue" regardless of whether the certificate is valid or not, it cannot get through. I suppose it is trying to connect to the NAS without SSL, which I have forbidden in the very settings I now cannot access.
The error is both unnerving and confusing because
- everything used to work fine up until the update, so I suppose it _may_ have broken something
- I have tried every conceivable way to access QTS: browser + local IP fails, browser + URL fails (access from the internet), access through QManager (mobile app) fails, access through HDStation fails, and SSH is disabled.
- the certificate is valid: I have just received the usual Let's Encrypt expiry bot e-mail, warning that the certificate will expire in 30 days
If anyone has an idea how I can regain control of my NAS, any hint would be much appreciated.