Hello everyone, I’m sharing the solution to a problem I ran into, in case it helps someone else. The symptom is very clear: everything works fine, but when you try to upload a file larger than a certain size (e.g., 40 or 50 MB), Nextcloud shows the frustrating message: Operation is blocked by acces…

In general, the basic rule set might cause some problems. But you can find some specific rule sets for Nextcloud: [image] GitHub - coreruleset/nextcloud-rule-exclusions-plugin: Rule exclusion plugin for Nextcloud Rule exclusion plugin for Nextcloud and…

Operation is blocked by access control Nginx Modsecurity problem

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tflidd July 15, 2025, 8:08am 2

In general, the basic rule set might cause some problems. But you can find some specific rule sets for Nextcloud:

and also numerous discussions here: