Bei den folgenden Ordnern ist die Überwachung von Änderungen fehlgeschlagen. Diese wird jede Minute erneut versucht, wodurch die Fehler bald verschwinden könnten. Falls diese fortbestehen, versuchen Sie, das zugrunde liegende Problem zu beheben und fragen Sie evtl. nach Hilfe. Support
CLIENTN-ED failed to setup inotify handler. Please increase inotify limits, see FAQ — Syncthing documentation
Did you read the linked FAQ entry? What did you already try to do, and how wasn’t this enough to solve your problem?
A bit more context would help us to help you. And more of us can help if you paste error messages in English 
I have only this error message and this only in German and i know the syncing is not working!
please tell me what else you need maybe I can get it for you
Just temporarily switch from German to English via the language menu at the top of Syncthing’s web UI.
Since the error is about inotify, I’m assuming it’s a Linux distribution. Which one?
How many files and/or directories are you trying to sync?
What kind of hardware is Syncthing running on?
For the following folders an error occurred while starting to watch for changes. It will be retried every minute, so the errors might go away soon. If they persist, try to fix the underlying issue and ask for help if you can’t. Support
CLIENTN-ED failed to setup inotify handler. Please increase inotify limits, see FAQ — Syncthing documentation
Android 13 / Qnap TS-431P2
88257files / 369GB
OUKITEL WP19pro Mobilephone
That error message is about what it says “watching for changes”. The fix is in the linked documentation. However you said “i know the syncing is not working!” - that doesn’t sound like watching changes. And as multiple people tried to tell you, it’s not clear at all what you mean. Imagine you didn’t know the situation you are in, and then explain it, in full. You can’t expect people to just guess your problem and the solution.
Although it’s for a different model QNAP, the solution should be the same or very similar to the one mentioned in the following earlier thread: https://forum.syncthing.net/t/qnap-tvs-h874x-i9-64g-age-old-failed-to-setup-inotify-handler-error-even-after-adding-inotify-max-user-watches-204800-to-the-sysctl-conf-file/21484
(It’s well worth carefully reading the entire thread before making any changes to your QNAP.)
Since you said things aren’t syncing, insufficient inotify settings wouldn’t prevent that from happening, it’d just mean that Syncthing would have to rely on scheduled rescans to find changes to sync. So you might still have a sync issue after reconfiguring inotify on your QNAP.
I increased the value (plus restarted), but unfortunately I still get the same error message! However, I have to say that the error message is on the Android phone side, but that is the same as with Linux. Are there instructions for Android to increase this value too???
It’s the same on Android, i.e. you need to write a number to /proc/sys/fs/inotify/max_user_watches on each boot. However, first of all, you will need root access in order to do this.
i am afraid to rooting!!!
Understandable but there is no other way to achieve this on Android (except for more advanced operations like creating a custom system image with the value tweaked out of the box, etc.).
You mentioned earlier that you had 88,257 files totalling 369 GB being synced. How many folders?
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