Error operation canceled

Hello everyone,

I have version 20.8 of nextcloud and I noticed that some users started to complain that the client was not synchronizing, when doing the test I noticed that it keeps checking and ends up with an error “operation canceled”, so I read several topics in the forum similar and I decided to test from the external address and then it works quickly and perfectly, the problem is happening from my local network, it takes a long time trying to check and ends up in this error