Background:
- A Synology NAS is connected two networks, N1 and N2, both are able to reach Domain X.
- The NAS was joined Domain X via N1. Share folders access is configured for domain users.
- The NAS was disconnected from N1 recently.
Issue:
Users reported shared folder is inaccessible due to "Network Error".
Actions(Done within N2):
- Verify NAS OS status and test shared folder access. OS is normal but shared folder can't be accessed.
- Restart SMB service then following by restarting NAS. Issue persists.
- Check default gateway and domain status. Noticed that domain was unavailable. Issue is rectified after rejoining Domain X with N2.
Conclusion:
Domain availability will cause shared folder access issue due to authentication, possibly.
I also noticed the same error, which appears to be caused by a time synchronization issue. In this case, the NAS NTP server was invalid, leading to a time discrepancy of more than 5 minutes between the domain and the NAS itself.
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