Value

Windows Constant 

Description

2

ERROR_FILE_NOT_FOUND

The system cannot find the file specified.

3

ERROR_PATH_NOT_FOUND

The system cannot find the path specified.

5

ERROR_ACCESS_DENIED

Access is denied.

8

ERROR_NOT_ENOUGH_MEMORY

Not enough storage is available to process this command.

10004

WSAEINTR

Interrupted function call. A blocking operation was interrupted by a call to WSACancelBlockingCall.

10013

WSAEACCES

Permission denied. An attempt was made to access a socket in a way forbidden by its access permissions. An example is using a broadcast address for "sendto" without broadcast permission being set using setsockopt (SO_BROADCAST).

10014

WSAEFAULT

Bad address. The system detected an invalid pointer address in attempting to use a pointer argument of a call. This error occurs if an program passes an invalid pointer value, or if the length of the buffer is too small. For instance, if the length of an argument which is a struct sockaddr is smaller than sizeof(struct sockaddr).

10022

WSAEINVAL

Invalid argument. Some invalid argument was supplied (for example, specifying an invalid level to the setsockopt function). In some instances, it also refers to the current state of the socket - for instance, calling accept on a socket that is not listening.

10024

WSAEMFILE

Too many open files. Too many open sockets. Each implementation may have a maximum number of socket handles available, either globally, per process or per thread.

10035

WSAEWOULDBLOCK

Resource temporarily unavailable. This error is returned from operations on non-blocking sockets that cannot be completed immediately, for example recv when no data is queued to be read from the socket. It is a non-fatal error, and the operation should be retried later. It is normal for WSAEWOULDBLOCK to be reported as the result from calling connect on a non-blocking SOCK_STREAM socket, since some time must elapse for the connection to be established.

10036

WSAEINPROGRESS

Operation now in progress. A blocking operation is currently executing. Windows Sockets only allows a single blocking operation to be outstanding per task (or thread), and if any other function call is made (whether or not it references that or any other socket) the function fails with the WSAEINPROGRESS error.

10037

WSAEALREADY

Operation already in progress. An operation was attempted on a non- blocking socket that already had an operation in progress - i.e. calling connect a second time on a non- blocking socket that is already connecting, or canceling an asynchronous request (WSAAsyncGetXbyY) that has already been canceled or completed.

10038

WSAENOTSOCK

Socket operation on a non-socket. An operation was attempted on something that is not a socket. Either the socket handle parameter did not reference a valid socket, or for select, a member of an fd_set was not valid.

10039

WSAEDESTADDRREQ

Destination address required. A required address was omitted from an operation on a socket. For example, this error will be returned if sendto is called with the remote address of ADDR_ANY.

10040

WSAEMSGSIZE

Message too long. 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 into was smaller than the datagram itself.

10041

WSAEPROTOTYPE

Protocol wrong type for socket. A protocol was specified in the socket function call that does not support the semantics of the socket type requested. For example, the ARPA Internet UDP protocol cannot be specified with a socket type of SOCK_STREAM.

10042

WSAENOPROTOOPT

Bad protocol option. An unknown, invalid or unsupported option or level was specified in a getsockopt or setsockopt call.

10043

WSAEPROTONOSUPPORT

Protocol not supported. The requested protocol has not been configured into the system, or no implementation for it exists. For example, a socket call requests a SOCK_DGRAM socket, but specifies a stream protocol.

10044

WSAESOCKTNOSUPPORT

Socket type not supported. The support for the specified socket type does not exist in this address family. For example, the optional type SOCK_RAW might be selected in a socket call, and the implementation does not support SOCK_RAW sockets at all.

10045

WSAEOPNOTSUPP

Operation not supported. The attempted operation is not supported for the type of object referenced. Usually this occurs when a socket descriptor to a socket that cannot support this operation, for example, trying to accept a connection on a datagram socket.

10046

WSAEPFNOSUPPORT

Protocol family not supported. The protocol family has not been configured into the system or no implementation for it exists. Has a slightly different meaning to WSAEAFNOSUPPORT, but is interchangeable in most cases, and all Windows Sockets functions that return one of these specify WSAEAFNOSUPPORT.

10047

WSAEAFNOSUPPORT

Address family not supported by protocol family. An address incompatible with the requested protocol was used. All sockets are created with an associated "address family" (i.e. AF_INET for Internet Protocols) and a generic protocol type (i.e. SOCK_STREAM).This error will be returned if an incorrect protocol is explicitly requested in the socket call, or if an address of the wrong family is used for a socket, e.g. in sendto.

10048

WSAEADDRINUSE

Address already in use. Only one usage of each socket address (protocol/IP address/port) is normally permitted. This error occurs if a program attempts to bind a socket to an IP address/port that has already been used for an existing socket, or a socket that wasn't closed properly, or one that is still in the process of closing. For server programs that need to bind multiple sockets to the same port number, consider using setsockopt(SO_REUSEADDR). Client programs usually need not call bind at all - connect will choose an unused port automatically.

10049

WSAEADDRNOTAVAIL

Cannot assign requested address. The requested address is not valid in its context. Normally results from an attempt to bind to an address that is not valid for the local machine, or connect/sendto an address or port that is not valid for a remote machine (e.g. port 0).

10050

WSAENETDOWN

Network is down. A socket operation encountered a dead network. This could indicate a serious failure of the network system (the protocol stack that the WinSock DLL runs over), the network interface, or the local network itself.

10051

WSAENETUNREACH

Network is unreachable. 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

Network dropped connection on reset. The host you were connected to crashed and rebooted. May also be returned by setsockopt if an attempt is made to set SO_KEEPALIVE on a connection that has already failed.

10053

WSAECONNABORTED

Software caused connection abort. An established connection was aborted by the software in your host machine, possibly due to a data transmission timeout or protocol error.

10054

WSAECONNRESET

Connection reset by peer. An existing connection was forcibly closed by the remote host. This normally results if the peer program on the remote host is suddenly stopped, the host is rebooted, or the remote host used a "hard close" (see setsockopt for more information on the SO_LINGER option on the remote socket.)

10055

WSAENOBUFS

No buffer space available. An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full.

10056

WSAEISCONN

Socket is already connected. A connect request was made on an already connected socket. Some implementations also return this error if sendto is called on a connected SOCK_DGRAM socket (For SOCK_STREAM sockets, the to parameter in sendto is ignored), although other implementations treat this as a legal occurrence.

10057

WSAENOTCONN

Socket is not connected. A request to send or receive data was disallowed because the socket is not connected and (when sending on a datagram socket using sendto) no address was supplied. Any other type of operation might also return this error - for example, setsockopt setting SO_KEEPALIVE if the connection has been reset.

10058

WSAESHUTDOWN

Cannot send after socket shutdown. 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. By calling shutdown a partial close of a socket is requested, which is a signal that sending or receiving or both has been discontinued.

10060

WSAETIMEDOUT

Connection timed out. A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.

10061

WSAECONNREFUSED

Connection refused. No connection could be made because the target machine actively refused it. This usually results from trying to connect to a service that is inactive on the foreign host - i.e. one with no server program running.

10064

WSAEHOSTDOWN

Host is down. A socket operation failed because the destination host was down. A socket operation encountered a dead host. Networking activity on the local host has not been initiated. These conditions are more likely to be indicated by the error WSAETIMEDOUT.

10065

WSAEHOSTUNREACH

No route to host. A socket operation was attempted to an unreachable host. See WSAENETUNREACH

10067

WSAEPROCLIM

Too many processes. A Windows Sockets implementation may have a limit on the number of programs that may use it simultaneously. WSAStartup may fail with this error if the limit has been reached.

10091

WSASYSNOTREADY

Network subsystem is unavailable. 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

WINSOCK.DLL version out of range. The current Windows Sockets implementation does not support the Windows Sockets specification version requested by the program. Check that no old Windows Sockets DLL files are being accessed.

10093

WSANOTINITIALISED

Successful WSAStartup not yet performed. Either the program has not called WSAStartup or WSAStartup failed. The program may be accessing a socket which the current active task does not own (i.e. trying to share a socket between tasks), or WSACleanup has been called too many times.

11001

WSAHOST_NOT_FOUND

Host not found. No such host is known. The name is not an official hostname 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 the specified name could not be found in the relevant database.

11002

WSATRY_AGAIN

Nonauthoritative host not found. This is usually a temporary error during hostname 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 is a non-recoverable error. This indicates some sort of non-recoverable error occurred during a database lookup. This may be because the database files (e.g. 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

Valid name, no data record of requested type. The requested name is valid and was found in the database, but it does not have the correct associated data being resolved for. The usual example for this is a hostname -> address translation attempt (using gethostbyname or WSAAsyncGetHostByName) which uses the DNS (Domain Name Server), and an MX record is returned but no A record - indicating the host itself exists, but is not directly reachable.