Fix NS_E_WMP_SERVER_NONEWCONNECTIONS (0XC00D11DE)

Quick answer

Restart the Windows Media Player Network Sharing Service (WMPNetworkSvc) and flush the DNS cache. If that doesn't work, check for corrupted media sharing libraries or reset the network profile.

What's actually happening here

I see this error about once every couple months when a client's streaming setup hits a wall. The error 0XC00D11DE means the server — your PC running WMP — has maxed out its connection pool. Windows Media Player can only handle 10 concurrent connections by default. Hit that limit, and any new client gets shut out.

But there's another common cause: a hung Windows Media Player Network Sharing Service. The service gets stuck holding stale connections after a sleep/wake cycle or a network drop. I had a client last month whose entire home theater setup stopped working because his laptop went to sleep mid-stream and the service never released the ports. Also, a corrupted media library — especially after a Windows update that resets file associations — can trigger this.

Step-by-step fix

1. Restart the sharing service — Open services.msc as admin, find Windows Media Player Network Sharing Service, right-click and restart. Watch for the service to stay running. If it stops again, you've got a deeper issue.
2. Flush DNS and reset Winsock — This clears any stuck network state. Open cmd as admin and run:
   ipconfig /flushdns
netsh winsock reset
netsh int ip reset
   Reboot after.
3. Clear the media library cache — WMP stores a database of shared media that can get corrupted. Close WMP completely, then delete the database files from %LOCALAPPDATA%\Microsoft\Media Player. Look for CurrentDatabase_*.wmdb files. WMP will rebuild them on next launch.
4. Check your firewall — Windows Firewall blocks ports if you've changed network profiles (e.g., from Private to Public). Go to Control Panel > Windows Defender Firewall > Allow an app through firewall. Make sure Windows Media Player and Windows Media Player Network Sharing Service are allowed on Private networks. If they're missing, add %ProgramFiles%\Windows Media Player\wmpnscfg.exe manually.
5. Reset network adapter — Last resort, but works if the error shows after a VPN disconnect. In Network Settings, go to Advanced network settings > Network reset. This reinstalls your network drivers and clears all IP settings. You'll need to reconnect to Wi-Fi afterward.

Alternative fixes if the steps above don't work

• Disable IPv6 on the network adapter — I've seen IPv6 cause this on some routers. Go to Network Connections, right-click your adapter, uncheck Internet Protocol Version 6 (TCP/IPv6).
• Run the WMP troubleshooter — Not my favorite, but sometimes it fixes registry issues. Search for Windows Media Player settings in Settings and run the troubleshooter.
• Re-register WMP components — Open cmd as admin and run:
  regsvr32 wmp.dll
regsvr32 wmploc.dll
regsvr32 wmpnssci.dll
• Check for third-party media server conflicts — Plex, Jellyfin, or even iTunes can hijack the same ports (usually 554, 1755, 10243). Stop those services temporarily to see if the error clears.

Prevention tip

If you regularly stream to multiple devices (like a home theater PC, Xbox, and phone), bump the connection limit. It's buried in the registry:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Media Player\Networking\
Create a DWORD called MaxConnections and set it to 20 or 30. Reboot. This stops the error from reappearing when you add more clients. Also, avoid letting your media server go to sleep while streaming — disable sleep mode in Power Settings when you're actively sharing.