Troubleshooting guide
How to fix the problem
After Windows 11 upgrade, NAS access may be changed by SMB security requirements, old protocol or saved login data. Start by upgrading your NAS and a named account. Don't enable SMB1 just because an old forum answer suggests it.
Possible solutions
Choose the method that matches your situation. Start with the simplest suitable option and check the result. If the problem is fixed, you do not need to continue with the other methods.
Network and connection check
Make sure the NAS is accessible at all.
Steps to follow
- Make a note of the exact Windows error and version that the winver command displays.
- Open the NAS administration address in a browser only on a trusted local network. If it is not available, check the network first.
- Check the path of the NAS share by its name or local IP in the address bar of the file browser.
- Log in to the NAS as a user with a password that has permission to a specific folder, not an anonymous guest account.
SMB version and signing
Check NAS and Windows security options.
Steps to follow
- In the NAS administration menu, check for official firmware updates and save a copy of settings and data before them.
- Enable supported SMB2/SMB3 according to NAS instruction and check SMB signing capability.
- Check the Microsoft documentation specifically for your Windows edition requirements; they may vary between versions and editions.
- After syncing, log in again with a named account. If the error persists, pass the exact code and NAS model to the administrator.
If the problem persists
If the NAS does not support the required secure SMB mode, contact its manufacturer for an update or a suitable replacement. Do not use a general security downgrade for your entire Windows computer as a first solution.
Request a repair