| Previous | Next |
| WSAECANCELLED | WSAEINVALIDPROVIDER |
WSAEINVALIDPROCTABLE
WSAEINVALIDPROCTABLE is a Winsock Service Provider Interface problem, not a remote network error. During provider initialization, Ws2_32 expects a valid procedure table describing the SPI entry points that it can call.
What Winsock validates
Microsoft documents this error when a service provider returns a bogus procedure table, commonly because one or more required function pointers are NULL. Layered providers are especially sensitive to this contract because the layer above calls the SPI functions exposed by the provider below it.
Likely diagnostic scope
- The provider DLL and catalog entry selected for the requested protocol chain.
- The version negotiation and output of
WSPStartup. - Every entry in the returned
WSPPROC_TABLE. - 32-bit versus 64-bit provider installation and catalog consistency.
Restarting the remote server cannot fix this code because the failure occurs while constructing the local provider call path. For old layered service providers, also remember that Microsoft deprecates LSP-based filtering in favor of Windows Filtering Platform on modern Windows.
Microsoft: Winsock error codes · Microsoft: WSPStartup · Microsoft: provider SPI and LSP notes
Looking for a different code? Search another status or error code.