SMB DIAGNOSTICS FOR WINDOWS
Shared folder
won’t open?
Find out why.
Trace NAS and Windows file-share connection problems. Understand the evidence and choose your next step.
Microsoft Store · Windows 10 / 11 · x64
See how it works\\studio-nas\projects
01 / Find the server
Server name resolved
02 / Reach the SMB service
TCP port 445 is reachable
SIGN-IN NEEDS ATTENTION
The server is reachable.Windows rejected the sign-in.
Next: check the NAS account and saved credentials.
Local-first diagnosis
Start without creating an account.
You stay in control
No automatic system-setting changes.
Evidence before action
See the finding, then the next step.
FOLLOW THE CONNECTION
From a vague error
to a clear next step.
A shared folder depends on more than Wi-Fi. SMB Doctor checks the connection in stages, so you can focus on what needs attention.
01 / RESOLVE
Find the server
Enter a path such as \\NAS\Documents. Check whether Windows can resolve the server name.
02 / CONNECT
Check the connection
Inspect the network route and TCP port 445, then check SMB policy and share access.
03 / EXPLAIN
Decide what to do next
Read the findings and safe next steps. Keep the evidence when you ask for help.
WHAT IT CHECKS
DNS resolution / TCP 445 / Network route
SMB client policy / Credential metadata / Share access
WORKS ON ONE PC, NOT THE OTHER?
Compare the evidence.
Spot the difference.
Export a diagnostic snapshot from each computer. Load both files into SMB Doctor to compare the results side by side.
Snapshots may contain computer names and share paths. Review them before sharing.
TWO PCS / ONE SHARE
Working PC ↔ Failing PC
Server name
Working: resolved · Failing: resolved
TCP port 445
Working: reachable · Failing: reachable
Share access
Working: allowed · Failing: denied
YOUR NETWORK. YOUR DECISION.
Local checks.
Intentional sharing.
Diagnosis runs on your PC. No account is needed to check a connection.
Need help? Review the privacy-filtered support report and choose whether to submit it. Reports are not uploaded automatically.
Rule-update checks can contact our server. Local snapshots and support reports are different: review each before sharing.
Read the privacy policyIs SMB Doctor free?
Yes. The current Microsoft Store version is free to download and use.
Will it change my Windows settings?
No. Diagnosis is read-only. It explains what it finds and suggests next steps; it does not automatically change security settings.
Does it work with my NAS?
It diagnoses Windows connections to SMB file shares, including NAS devices and Windows shares. It does not manage or repair the NAS itself.
Which Windows versions are supported?
Windows 10 version 2004 or later, and Windows 11, on x64 PCs. Check the Microsoft Store listing for requirements.
What if my problem is still unresolved?
Review and submit a support report from the app, or use the support page. Include the report ID if one is available. Never send passwords.
Available on Microsoft Store