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I'm using a Synology S420j (running DSM 6.2.4-25556) to backup files from my Mac (Monterey v12.1) using the following command:

rsync -avz --backup rsync-user@nas.local::backups/

This has previously worked, but I've been changing a few things recently and now I'm getting this error:

@ERROR: host is denied to login
rsync error: error starting client-server protocol (code 5) at /System/Volumes/Data/SWE/macOS/BuildRoots/5b2e67f8af/Library/Caches/com.apple.xbs/Sources/rsync/rsync-55/rsync/main.c(1402) [receiver=2.6.9]
stevec
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1 Answers1

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(Posting this here because I didn't get any results searching the Internet.)

https://serverfault.com/a/564472/31465 gave me a hint that there might be a feature within Synology related to this. And it turns out that there is - under Control Panel, Security, Account, Auto Block.

Simply disabling this option fixed the issue I was having with rsync.

stevec
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