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WSAENETDOWN
WSAENETDOWN means that the Windows networking subsystem has failed. It is broader than a missing route to one destination and normally affects more than one socket operation.
How to distinguish it
Compare this error with WSAENETUNREACH, which concerns a particular destination network. WSAENETDOWN points to local networking availability: adapters, drivers, the protocol stack, or a system-level failure.
What to check
- Check whether unrelated applications and sockets are also failing.
- Inspect adapter status, driver events, and changes such as VPN or firewall software installation.
- Do not hide the error with immediate retry loops; recover only after local networking has become available again.
Microsoft: connect · Microsoft: Windows Sockets Error Codes
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