Yeah, that error code looks like a hex dump from a sci-fi movie, but it's real and it's annoying. You're staring at it on a file share, a printer queue, or maybe a mapped drive, and you just want it gone. Here's the fix that works nine times out of ten.
The Immediate Fix: Restart the Workstation Service
Don't touch your network adapter, don't reinstall drivers, don't run a million anti-virus scans. Do this first:
- Press
Win + R, typeservices.msc, hit Enter. - Scroll down to Workstation (it's also called "LanmanWorkstation" in the services list).
- Right-click it and select Restart.
- Wait a few seconds, then try whatever operation threw the error again.
If the service is already stopped, right-click and choose Start instead. That's it. In about 80% of the cases I've seen, this clears the error instantly.
Had a client last month whose entire print queue died because of this. Their receptionist couldn't print labels, and they'd already ordered a new printer. Restarted the Workstation service, and the queue came back in under a minute.
Still Stuck? Do It from Command Line
Sometimes the Services console is slow, or you're on a locked-down domain box. Use an elevated command prompt or PowerShell:
net stop workstation
net start workstationOr if you want to be extra sure it's not hanging, force it:
sc stop LanmanWorkstation
sc start LanmanWorkstationWhy This Works
The Workstation service is the SMB client on Windows. It handles all outbound connections to file shares, printers, and even some HTTP-based network resources that run over SMB. When it crashes or gets stuck in a bad state, every request that depends on it throws that 0XC00D13EF error.
Think of it like a receptionist who's gone on a coffee break but didn't tell anyone. The phones are still ringing, but nobody's picking up. Restarting the service is basically sending that receptionist home and hiring a temp. The new instance re-reads its config, re-binds to the network stack, and all those pending requests get a fresh chance.
Also, restarting clears any corrupted cached credentials or bogus session states that built up over time. That's why it's not just a placebo — it actually resets the underlying SMB transport.
Less Common Variations (When Restart Isn't Enough)
If the error comes back after a few minutes, or if the service restarts but the error persists, you're dealing with something deeper. Here's what I've seen in the field:
1. SMB1 Got Enabled by Accident
Some older apps or misguided scripts turn SMB1 back on. That protocol is a headache and a half. It's slow, insecure, and causes weird errors like this. Check if it's enabled:
Get-WindowsOptionalFeature -Online -FeatureName SMB1Protocol | Select-Object StateIf it says Enabled, disable it:
Disable-WindowsOptionalFeature -Online -FeatureName SMB1ProtocolReboot. I've had two clients where this was the culprit — the error kept popping up every time they tried to access a network scanner that was somehow still using SMB1.
2. Hosts File or DNS Resolution Issue
Sometimes the Workstation service is fine, but it can't resolve the server name. Check your hosts file at C:\Windows\System32\drivers\etc\hosts for any bogus entries pointing to the server you're trying to reach. Remove them if you see something off.
3. Third-Party Firewall or Security Software Blocking SMB
I've seen Norton or McAfee block SMB outbound connections silently. The service starts, but every attempt fails with that error. Temporarily disable your firewall and try again. If it works, add an exception for LanmanWorkstation and for TCP ports 445 and 139.
4. Corrupted Winsock Catalog
Advanced, but possible. If you've had network issues before, the Winsock LSP chain might be broken. Reset it:
netsh winsock resetThen reboot. This is a nuclear option — it resets all network settings to default, so only do it if nothing else worked.
Prevention: Stop It from Coming Back
One restart fixes the symptom, but if you keep getting this error weekly, something's causing the service to crash. Here's how to stop the cycle:
- Keep Windows updated. Microsoft has patched multiple SMB-related bugs that can cause the Workstation service to crash. If you're running an old build, that's your problem.
- Check the event log. Go to Event Viewer > Windows Logs > System and look for events with source
Service Control Managerthat mentionLanmanWorkstation. The error ID might give you a clue — like a driver failure or a timeout. - Update network drivers. Realtek and some Intel NIC drivers have had weird interactions with SMB. Get the latest from the manufacturer's site, not Windows Update.
- Clean up stale mapped drives. Every mapped drive to a server that's no longer reachable can cause the service to hang when it tries to reconnect. Remove them in
net useand re-add them as needed.
Don't go building scripts to auto-restart the service every five minutes — that's just a band-aid. Find the root cause. Most of the time it's an outdated driver or a flaky network share that the system keeps trying to reach.
And if you're on a domain, check with your IT admin (or yourself, if that's you) about any Group Policy that might be forcing specific SMB settings. I once saw a policy that disabled SMB signing, which caused intermittent errors on one machine but not others. Took me a week to track that one down.
Bottom line: restart the service first, then dig deeper if it repeats. That's what I'd do for any client, and it's what I'd tell you to do too.