Winsock Error Codes
The Windows Sockets API (Winsock) provides a set of functions for network communication. When these functions encounter errors, they return specific error codes that can help diagnose and resolve issues. This page lists and describes the common Winsock error codes.
Common Winsock Error Codes
These error codes are returned by Winsock functions to indicate specific network-related problems.
| Error Code | Symbolic Name | Description |
|---|---|---|
| 10004 | WSAEINTR |
A blocking operation was interrupted by a call to WSACancelBlockingCall. |
| 10013 | WSAEACCES |
An attempt was made to access a socket in a way forbidden by its access permissions. |
| 10014 | WSAEDESTADDRREQ |
A destination address was required but was omitted. |
| 10015 | WSAEOPNOTSUPP |
An attempt was made to operate on something that this is not supported. |
| 10016 | WSAEPRO_ERROR |
A system call shich the service depends on failed. |
| 10017 | WSAEPROTOTYP |
An operation was attempted on a protocol type not supported or known. |
| 10018 | WSAEPROTONOSUPPORT |
A protocol is not supported by the Windows Sockets implementation. |
| 10019 | WSAESOCKNOSUPPORT |
The kind of socket requested is not supported by this particular protocol family. |
| 10020 | WSAEPROTONOTSUPPORT |
The requested protocol is not supported by the Windows Sockets implementation. |
| 10021 | WSAEPROCLIM |
A WinSock implementation has exceeded its configured limit for per-process or system-wide, concurrently open sockets. |
| 10022 | WSAEOPNOTSUPP |
An attempt was made to operate on something that is not supported. |
| 10024 | WSAEPFNOSUPPORT |
The specified procedure is not supported by this protocol family. |
| 10025 | WSAEPFNOSUPPORT |
The specified procedure is not supported by this protocol family. |
| 10026 | WSAESOCKSHUTDOWN |
A socket that is not connected has been selected for a connection attempt. |
| 10035 | WSAEWOULDBLOCK |
A non-blocking socket operation could not be completed immediately. |
| 10036 | WSAEINPROGRESS |
A blocking Winsock operation is in progress. |
| 10037 | WSAEALREADY |
A non-blocking socket is already connected. |
| 10038 | WSAENOTSOCK |
An operation was attempted on something that is not a socket. |
| 10039 | WSAEDESTADDRREQ |
A destination address was required but was omitted. |
| 10040 | WSAEMSGSIZE |
A message is too long to be sent. |
| 10041 | WSAEPROTOOPT |
A protocol-specific error occurred. |
| 10042 | WSAEPFNOSUPPORT |
A specified protocol family or protocol is not supported. |
| 10043 | WSAEAFNOSUPPORT |
A specified address family is not supported. |
| 10044 | WSAEPROTOTYP |
A specified protocol is not supported for the specified address family. |
| 10045 | WSAESOCKTNOSUPPORT |
The requested socket type is not supported. |
| 10046 | WSAEOPNOTSUPP |
The attempted operation is not supported for the type of object referenced. |
| 10047 | WSAEADDRINUSE |
A specified address is already in use. |
| 10048 | WSAEADDRNOTAVAIL |
A requested address is not valid in its context. |
| 10049 | WSAENETDOWN |
A socket operation encountered a dead network. |
| 10050 | WSAENETUNREACH |
A socket operation tried to use an unreachable network. |
| 10051 | WSAENETRESET |
A socket operation reset the network. |
| 10052 | WSAECONNABORTED |
A connection has been aborted due to a network reset or a failure in the remote host. |
| 10053 | WSAECONNRESET |
A connection has been reset by the peer. |
| 10054 | WSAENOTCONN |
A socket is not connected. |
| 10055 | WSAETIMEOUT |
A connection attempt timed out without establishing a connection. |
| 10056 | WSAECONNREFUSED |
A connection attempt was refused by the remote host. |
| 10057 | WSAELOOP |
A loopback connection is not allowed. |
| 10058 | WSAENAMETOOLONG |
A name was too long to be included in the necessary system structures. |
| 10059 | WSAENOTEMPTY |
A network (or related name space) was disconnected. |
| 10060 | WSAEDISCON |
A connection was gracefully closed by the remote host. |
| 10061 | WSAEREMOTEHOSTCLOSED |
The connection was reset by the remote host. |
| 10062 | WSAENETRESET |
A network connection was aborted because the protocol could not be satisfied. |
| 10063 | WSAENETUNREACH |
A socket operation tried to use an unreachable network. |
| 10064 | WSAENETDOWN |
A socket operation encountered a dead network. |
| 10065 | WSAEHOST_NOT_FOUND |
The requested name is valid, but no data of the requested type was found. |
| 10066 | WSAEPROTOTYP |
A protocol specified in the requested combination of address family, socket type, and protocol is not supported. |
| 10067 | WSAEPROCLIM |
A system call invoked by a service that a Winsock implementation depends on failed. |
| 10068 | WSAEUSERS |
Too many users, or too many connections. |
| 10069 | WSAEDQUOT |
The quota for a user or group has been exceeded. |
| 10070 | WSAESTALE |
A file handle is no longer valid. |
| 10071 | WSAEREMOTE |
This object may be a remote file system. |
| 10072 | WSAELOOP |
Too many levels of symbolic links. |
| 10073 | WSAENAMETOOLONG |
A name or reference to a file that is too long. |
| 10074 | WSAEHOST_DOWN |
A name resolution service is not known. |
| 10075 | WSAENETDOWN |
A network subsystem has failed. |
| 10076 | WSAENETUNREACH |
A socket operation tried to use an unreachable network. |
| 10077 | WSAENETRESET |
A connection has been broken because of keep-alive activity. |
| 10078 | WSAECONNABORTED |
A connection has been aborted because of an intermittent network problem. |
| 10079 | WSAECONNRESET |
A connection has been reset by the peer. |
| 10080 | WSAENOTCONN |
A socket is not connected. |
| 10081 | WSAETIMEOUT |
A connection attempt timed out without establishing a connection. |
| 10082 | WSAECONNREFUSED |
A connection attempt was refused by the remote host. |
| 10083 | WSAELOOP |
A loopback connection is not allowed. |
| 10084 | WSAENAMETOOLONG |
A name was too long to be included in the necessary system structures. |
| 10085 | WSAENOTEMPTY |
A network (or related name space) was disconnected. |
| 10086 | WSAEDISCON |
A connection was gracefully closed by the remote host. |
| 10087 | WSAEREMOTEHOSTCLOSED |
The connection was reset by the remote host. |
| 10088 | WSAENETRESET |
A network connection was aborted because the protocol could not be satisfied. |
| 10089 | WSAENETUNREACH |
A socket operation tried to use an unreachable network. |
| 10090 | WSAENETDOWN |
A socket operation encountered a dead network. |
| 10091 | WSAEHOST_NOT_FOUND |
The requested name is valid, but no data of the requested type was found. |
| 10092 | WSAEPROTOTYP |
A protocol specified in the requested combination of address family, socket type, and protocol is not supported. |
| 10093 | WSAEPROCLIM |
A system call invoked by a service that a Winsock implementation depends on failed. |
| 10094 | WSAEUSERS |
Too many users, or too many connections. |
| 10095 | WSAEDQUOT |
The quota for a user or group has been exceeded. |
| 10096 | WSAESTALE |
A file handle is no longer valid. |
| 10097 | WSAEREMOTE |
This object may be a remote file system. |
| 10098 | WSAELOOP |
Too many levels of symbolic links. |
| 10099 | WSAENAMETOOLONG |
A name or reference to a file that is too long. |
| 10100 | WSAEHOST_DOWN |
A name resolution service is not known. |
| 10101 | WSAENETDOWN |
A network subsystem has failed. |
| 10102 | WSAENETUNREACH |
A socket operation tried to use an unreachable network. |
| 10103 | WSAENETRESET |
A connection has been broken because of keep-alive activity. |
| 10104 | WSAECONNABORTED |
A connection has been aborted because of an intermittent network problem. |
| 10105 | WSAECONNRESET |
A connection has been reset by the peer. |
| 10106 | WSAENOTCONN |
A socket is not connected. |
| 10107 | WSAETIMEOUT |
A connection attempt timed out without establishing a connection. |
| 10108 | WSAECONNREFUSED |
A connection attempt was refused by the remote host. |
| 10109 | WSAELOOP |
A loopback connection is not allowed. |
| 10110 | WSAENAMETOOLONG |
A name was too long to be included in the necessary system structures. |
| 10111 | WSAENOTEMPTY |
A network (or related name space) was disconnected. |
| 10112 | WSAEDISCON |
A connection was gracefully closed by the remote host. |
| 10113 | WSAEREMOTEHOSTCLOSED |
The connection was reset by the remote host. |
| 10114 | WSAENETRESET |
A network connection was aborted because the protocol could not be satisfied. |
| 10115 | WSAENETUNREACH |
A socket operation tried to use an unreachable network. |
| 10116 | WSAENETDOWN |
A socket operation encountered a dead network. |
| 10117 | WSAEHOST_NOT_FOUND |
The requested name is valid, but no data of the requested type was found. |
| 10118 | WSAEPROTOTYP |
A protocol specified in the requested combination of address family, socket type, and protocol is not supported. |
| 10119 | WSAEPROCLIM |
A system call invoked by a service that a Winsock implementation depends on failed. |
| 10120 | WSAEUSERS |
Too many users, or too many connections. |
| 10121 | WSAEDQUOT |
The quota for a user or group has been exceeded. |
| 10122 | WSAESTALE |
A file handle is no longer valid. |
| 10123 | WSAEREMOTE |
This object may be a remote file system. |
| 10124 | WSAELOOP |
Too many levels of symbolic links. |
| 10125 | WSAENAMETOOLONG |
A name or reference to a file that is too long. |
| 10126 | WSAEHOST_DOWN |
A name resolution service is not known. |
| 10127 | WSAENETDOWN |
A network subsystem has failed. |
| 10128 | WSAENETUNREACH |
A socket operation tried to use an unreachable network. |
| 10129 | WSAENETRESET |
A connection has been broken because of keep-alive activity. |
| 10130 | WSAECONNABORTED |
A connection has been aborted because of an intermittent network problem. |
| 10131 | WSAECONNRESET |
A connection has been reset by the peer. |
| 10132 | WSAENOTCONN |
A socket is not connected. |
| 10133 | WSAETIMEOUT |
A connection attempt timed out without establishing a connection. |
| 10134 | WSAECONNREFUSED |
A connection attempt was refused by the remote host. |
| 10135 | WSAELOOP |
A loopback connection is not allowed. |
| 10136 | WSAENAMETOOLONG |
A name was too long to be included in the necessary system structures. |
| 10137 | WSAENOTEMPTY |
A network (or related name space) was disconnected. |
| 10138 | WSAEDISCON |
A connection was gracefully closed by the remote host. |
| 10139 | WSAEREMOTEHOSTCLOSED |
The connection was reset by the remote host. |
| 10140 | WSAENETRESET |
A network connection was aborted because the protocol could not be satisfied. |
| 10141 | WSAENETUNREACH |
A socket operation tried to use an unreachable network. |
| 10142 | WSAENETDOWN |
A socket operation encountered a dead network. |
| 10143 | WSAEHOST_NOT_FOUND |
The requested name is valid, but no data of the requested type was found. |
| 10144 | WSAEPROTOTYP |
A protocol specified in the requested combination of address family, socket type, and protocol is not supported. |
| 10145 | WSAEPROCLIM |
A system call invoked by a service that a Winsock implementation depends on failed. |
| 10146 | WSAEUSERS |
Too many users, or too many connections. |
| 10147 | WSAEDQUOT |
The quota for a user or group has been exceeded. |
| 10148 | WSAESTALE |
A file handle is no longer valid. |
| 10149 | WSAEREMOTE |
This object may be a remote file system. |
| 10150 | WSAELOOP |
Too many levels of symbolic links. |
| 10151 | WSAENAMETOOLONG |
A name or reference to a file that is too long. |
| 10152 | WSAEHOST_DOWN |
A name resolution service is not known. |
More Information
For a comprehensive list and detailed explanations, please refer to the official Microsoft documentation: