Could you help with the following issue please?

Short version
Following a successful Cloudron platform upgrade, all our apps now display the following error:
Error : Nginx Error - Error reloading nginx: reverseproxy exited with code 1 signal null

The apps / services run ok; the only issues are 1) no backups were taken since the Cloudron platform upgrade, likely due to the app error status and 2) the apps can't be stopped / restarted likely due to the same error.

The underlying cause must be related to certificates, I would guess, so upon checking the renew certificates log I found these telling lines:

Apr 08 02:15:47 box:shell nginx: [emerg] cannot load certificate "/home/yellowtent/platformdata/nginx/cert/_.<our_website>.<our_cloudron_domain>.cert": BIO_new_file() failed (SSL: error:02001002:system library:fopen:No such file or directory:fopen('/home/yellowtent/platformdata/nginx/cert/_.<our_website>.<our_cloudron_domain>.cert','r') error:2006D080:BIO routines:BIO_new_file:no such file)
Apr 08 02:15:47 box:shell reverseproxy: /usr/bin/sudo -S /home/yellowtent/box/src/scripts/restartservice.sh nginx errored BoxError: reverseproxy exited with code 1 signal null
Apr 08 02:15:47 at ChildProcess.<anonymous> (/home/yellowtent/box/src/shell.js:137:19)
Apr 08 02:15:47 at ChildProcess.emit (node:events:519:28)
Apr 08 02:15:47 at ChildProcess._handle.onexit (node:internal/child_process:294:12) {
Apr 08 02:15:47 reason: 'Shell Error',
Apr 08 02:15:47 details: {},
Apr 08 02:15:47 code: 1,
Apr 08 02:15:47 signal: null
Apr 08 02:15:47 }
Apr 08 02:15:47 box:taskworker Task took 347.55 seconds
Apr 08 02:15:47 box:tasks setCompleted - 8714: {"result":null,"error":{"stack":"BoxError: Error reloading nginx: reverseproxy exited with code 1 signal null\n at reload (/home/yellowtent/box/src/reverseproxy.js:188:22)\n at process.processTicksAndRejections (node:internal/process/task_queues:95:5)\n at async checkCerts (/home/yellowtent/box/src/reverseproxy.js:698:9)","name":"BoxError","reason":"Nginx Error","details":{},"message":"Error reloading nginx: reverseproxy exited with code 1 signal null"}}

Interestingly <our_website> is the only domain set up with manual DNS configuration in Cloudron, but this has been the case for years and it worked/works, until the latest Cloudron platform upgrade. But sure, the renew certificates log above is correct, there is no cert file at /home/yellowtent/platformdata/nginx/cert/_.<our_website>.<our_cloudron_domain>.cert but it should not be looking for one locally on our server, should it?

Longer version
The Cloudron platform upgrade from v8.2.4 to v8.3.1 was successful on 29/03/2025. Our last Cloudron app backups are from 29/03/2025 as well.

Our Cloudron apps now have a status of:
Error : Nginx Error - Error reloading nginx: reverseproxy exited with code 1 signal null

Starting up development instances of Cloudron apps (which are not running normally) gets a status of "Starting - Configuring reverse proxy", which after it sticks around for way too long, errors out with the same message as above. Trying to repair the app with the "Retry start app task" leads nowhere other than the same error being displayed again. And we can't stop any of these apps either, but they are nevertheless running.

All the renew certificates logs since 29/03/2025 have an error red x next to them; the relevant log output is mentioned above. Why is the reverse proxy getting stuck looking for the certificate of <our_website> which we have on manual DNS setup in Cloudron? And how do we tell it to not check this certificate any more? I'm guessing this is where the issue is.

Funny enough, according to the Cloudron event log, the certificate install for www.<our_website> succeeded on 01/04/2025 (proving the manual DNS setup has worked for years), this is 3 days after the Cloudron platform upgrade on 29/03/2025 but obviously the reverse proxy doesn't know / isn't happy with the certificate for <our_website> for whatever reason.

Can you advise how we fix this please? Thank you in advance.

THI Staff