How to fix the Synology Cloud Sync "Unknown error occurs" non sense
I sync my data from my Seafile instance back to my NAS. Well, when it works.
In the most random fashion, my Synology NAS "Cloud Sync" enjoys to take a break. And up until now, it seemed impossible to get it back to sync.
You would expect that restarting the app would trigger a resync, but alas, no, it doesn't. We're talking about Synology here, right.
The only option was to unlinking and relinking stuff, which meant reconfiguring. A massive pain when Cloud Sync fails every couple of weeks.
After an hour of digging in the logs, searching the dark corner of the internet, I finally found the solution by one brave man called @mback2k on Github.
So yeah, there it is. When Cloud Sync gets stuck, Cloud Sync will NEVER try to sync again.
Procedure to fix this non sense:
- SSH as root on your NAS.
- Then open up the DB for Cloud Sync and update the session_table table:
root@crappynas:/volume1/@cloudsync/db# sqlite3 SQLite version 3.10.2 2016-01-20 15:27:19 Enter ".help" for usage hints. Connected to a transient in-memory database. Use ".open FILENAME" to reopen on a persistent database. sqlite> .open config.sqlite sqlite> SELECT sync_folder,error FROM session_table; /@Snapshot/@PushServ|0 /ANDROID|-12 /DATA|-12 sqlite> UPDATE session_table SET error = 0 WHERE error = -12; sqlite> SELECT sync_folder,error FROM session_table; /@Snapshot/@PushServ|0 /ANDROID|0 /DATA|0
- Restart the Cloud Sync app by navigating to the Package Center, click stop:
- Then when it's stopped, click "Run".
Syncing should resume.
Thank you Synology, you never disappoint.