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Socket Exception Codes

The table below lists the Windows Socket Error Codes with a brief explanation of what they mean.

[PDF version here]

For a more in-depth description please refer to the Microsoft resource on this topic:
https://learn.microsoft.com/en-us/windows/win32/winsock/windows-sockets-error-codes-2

Value Return Code Description
6 WSA_INVALID_HANDLE Insufficient memory available.
8 WSA_NOT_ENOUGH_MEMORY One or more parameters are invalid.
87 WSA_INVALID_PARAMETER An application used a Windows Sockets function which directly maps to a Windows function which is indicating a problem with one or more parameters.
995 WSA_OPERATION_ABORTED An overlapped operation was canceled due to the closure of the socket, or the execution of the SIO_FLUSH command in WSAIoctl
996 WSA_IO_INCOMPLETE The application has tried to determine the status of an overlapped operation which is not yet completed.
997 WSA_IO_PENDING The application has initiated an overlapped operation that cannot be completed immediately.
10004 WSAEINTR A blocking operation was interrupted by a call to WSACancelBlockingCall.
10009 WSAEBADF The file handle supplied is not valid.
10013 WSAEACCES An attempt was made to access a socket in a way forbidden by its access permissions.
10014 WSAEFAULT The system detected an invalid pointer address in attempting to use a pointer argument of a call.
10022 WSAEINVAL Some invalid argument was supplied.
10024 WSAEMFILE Too many open sockets.
10035 WSAEWOULDBLOCK Resource temporarily unavailable.
10036 WSAEINPROGRESS A blocking operation is currently executing.
10037 WSAEALREADY An operation was attempted on a nonblocking socket with an operation already in progress
10038 WSAENOTSOCK An operation was attempted on something that is not a socket.
10039 WSAEDESTADDRREQ A required address was omitted from an operation on a socket.
10040 WSAEMSGSIZE A message sent on a datagram socket was larger than the internal message buffer or some other network limit, or the buffer used to receive a datagram was smaller than the datagram itself.
10041 WSAEPROTOTYPE Protocol wrong type for socket.
10042 WSAENOPROTOOPT Bad protocol option.
10043 WSAEPROTONOSUPPORT The requested protocol has not been configured into the system, or no implementation for it exists.
10044 WSAESOCKTNOSUPPORT The support for the specified socket type does not exist in this address family.
10045 WSAEOPNOTSUPP The attempted operation is not supported for the type of object referenced.
10046 WSAEPFNOSUPPORT Protocol family not supported.
10047 WSAEAFNOSUPPORT An address incompatible with the requested protocol was used.
10048 WSAEADDRINUSE Address already in use.
10049 WSAEADDRNOTAVAIL The requested address is not valid in its context.
10050 WSAENETDOWN A socket operation encountered a dead network. This could indicate a serious failure of the network system, the network interface, or the local network itself.
10051 WSAENETUNREACH A socket operation was attempted to an unreachable network. This usually means the local software knows no route to reach the remote host.
10052 WSAENETRESET The connection has been broken due to keep-alive activity detecting a failure while the operation was in progress.
10053 WSAECONNABORTED An established connection was aborted by the software in your host computer, possibly due to a data transmission time-out or protocol error.
10054 WSAECONNRESET An existing connection was forcibly closed by the remote host.
10055 WSAENOBUFS An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full.
10056 WSAEISCONN A connect request was made on an already-connected socket.
10057 WSAENOTCONN A request to send or receive data was disallowed because the socket is not connected and no address was supplied.
10058 WSAESHUTDOWN A request to send or receive data was disallowed because the socket had already been shut down in that direction with a previous shutdown call.
10059 WSAETOOMANYREFS Too many references to some kernel object.
10060 WSAETIMEDOUT A connection attempt failed because the connected party did not properly respond after a period of time.
10061 WSAECONNREFUSED No connection could be made because the target computer actively refused it. This usually results from trying to connect to a service that is inactive on the foreign host.
10062 WSAELOOP Cannot translate a name.
10063 WSAENAMETOOLONG A name component or a name was too long.
10064 WSAEHOSTDOWN A socket operation failed because the destination host is down or dead.
10065 WSAEHOSTUNREACH No route to host.
10066 WSAENOTEMPTY Cannot remove a directory that is not empty.
10067 WSAEPROCLIM Too many processes; the number of applications that can use this socket simultaneously has been reached.
10068 WSAEUSERS Ran out of user quota.
10069 WSAEDQUOT Ran out of disk quota.
10070 WSAESTALE The file handle reference is no longer available.
10071 WSAEREMOTE The item is not available locally.
10091 WSASYSNOTREADY This error is returned by WSAStartup if the Windows Sockets implementation cannot function at this time because the underlying system it uses to provide network services is currently unavailable.
10092 WSAVERNOTSUPPORTED The current Windows Sockets implementation does not support the Windows Sockets specification version requested by the application. Check that no old Windows Sockets DLL files are being accessed.
10093 WSANOTINITIALISED Successful WSAStartup not yet performed.
10101 WSAEDISCON Graceful shutdown in progress.
10102 WSAENOMORE No more results can be returned by the WSALookupServiceNext function.
10103 WSAECANCELLED A call to the WSALookupServiceEnd function was made while this call was still processing. The call has been canceled.
10104 WSAEINVALIDPROCTABLE The service provider procedure call table is invalid. A service provider returned a bogus procedure table to Ws2_32.dll. This is usually caused by one or more of the function pointers being NULL.
10105 WSAEINVALIDPROVIDER The requested service provider is invalid. This error is returned if the protocol entry specified could not be found, or the service provider returned a version number other than 2.0.
10106 WSAEPROVIDERFAILEDINIT The requested service provider could not be loaded or initialized.
10107 WSASYSCALLFAILURE A system call that should never fail has failed. This is a generic error code, returned under various conditions.
10108 WSASERVICE_NOT_FOUND No such service is known. The service cannot be found in the specified name space.
10109 WSATYPE_NOT_FOUND The specified class was not found.
10110 WSA_E_NO_MORE No more results can be returned by the WSALookupServiceNext function.
10111 WSA_E_CANCELLED A call to the WSALookupServiceEnd function was made while this call was still processing. The call has been canceled.
10112 WSAEREFUSED A database query failed because it was actively refused.
11001 WSAHOST_NOT_FOUND No such host is known. The name is not an official host name or alias, or it cannot be found in the database(s) being queried. This error may also be returned for protocol and service queries, and means that the specified name could not be found in the relevant database.
11002 WSATRY_AGAIN This is usually a temporary error during host name resolution and means that the local server did not receive a response from an authoritative server. A retry at some time later may be successful.
11003 WSANO_RECOVERY This indicates that some sort of nonrecoverable error occurred during a database lookup. This may be because the database files (for example, BSD-compatible HOSTS, SERVICES, or PROTOCOLS files) could not be found, or a DNS request was returned by the server with a severe error.
11004 WSANO_DATA The requested name is valid and was found in the database, but it does not have the correct associated data being resolved for.
11005 WSA_QOS_RECEIVERS At least one QoS reserve has arrived.
11006 WSA_QOS_SENDERS At least one QoS send path has arrived.
11007 WSA_QOS_NO_SENDERS There are no QoS senders.
11008 WSA_QOS_NO_RECEIVERS There are no QoS receivers.
11009 WSA_QOS_REQUEST_CONFIRMED The QoS reserve request has been confirmed.
11010 WSA_QOS_ADMISSION_FAILURE A QoS error occurred due to lack of resources.
11011 WSA_QOS_POLICY_FAILURE The QoS request was rejected because the policy system couldn't allocate the requested resource within the existing policy.
11012 WSA_QOS_BAD_STYLE An unknown or conflicting QoS style was encountered.
11013 WSA_QOS_BAD_OBJECT A problem was encountered with some part of the filterspec or the provider-specific buffer in general.
11014 WSA_QOS_TRAFFIC_CTRL_ERROR An error with the underlying traffic control (TC) API as the generic QoS request was converted for local enforcement by the TC API. This could be due to an out of memory error or to an internal QoS provider error.
11015 WSA_QOS_GENERIC_ERROR A general QoS error.
11016 WSA_QOS_ESERVICETYPE An invalid or unrecognized service type was found in the QoS flowspec.
11017 WSA_QOS_EFLOWSPEC An invalid or inconsistent flowspec was found in the QOS structure.
11018 WSA_QOS_EPROVSPECBUF An invalid QoS provider-specific buffer.
11019 WSA_QOS_EFILTERSTYLE An invalid QoS filter style was used.
11020 WSA_QOS_EFILTERTYPE An invalid QoS filter type was used.
11021 WSA_QOS_EFILTERCOUNT An incorrect number of QoS FILTERSPECs were specified in the FLOWDESCRIPTOR.
11022 WSA_QOS_EOBJLENGTH An object with an invalid ObjectLength field was specified in the QoS provider-specific buffer.
11023 WSA_QOS_EFLOWCOUNT An incorrect number of flow descriptors was specified in the QoS structure.
11024 WSA_QOS_EUNKOWNPSOBJ An unrecognized object was found in the QoS provider-specific buffer.
11025 WSA_QOS_EPOLICYOBJ An invalid policy object was found in the QoS provider-specific buffer.
11026 WSA_QOS_EFLOWDESC An invalid QoS flow descriptor was found in the flow descriptor list.
11027 WSA_QOS_EPSFLOWSPEC An invalid or inconsistent flowspec was found in the QoS provider-specific buffer.
11028 WSA_QOS_EPSFILTERSPEC An invalid FILTERSPEC was found in the QoS provider-specific buffer.
11029 WSA_QOS_ESDMODEOBJ An invalid shape discard mode object was found in the QoS provider-specific buffer.
11030 WSA_QOS_ESHAPERATEOBJ An invalid shaping rate object was found in the QoS provider-specific buffer.
11031 WSA_QOS_RESERVED_PETYPE A reserved policy element was found in the QoS provider-specific buffer.