SocketError SocketError SocketError SocketError Enum


Defines error codes for the Socket class.

public enum class SocketError
public enum SocketError
type SocketError = 
Public Enum SocketError


AccessDenied AccessDenied AccessDenied AccessDenied 10013

An attempt was made to access a Socket in a way that is forbidden by its access permissions.

AddressAlreadyInUse AddressAlreadyInUse AddressAlreadyInUse AddressAlreadyInUse 10048

Only one use of an address is normally permitted.

AddressFamilyNotSupported AddressFamilyNotSupported AddressFamilyNotSupported AddressFamilyNotSupported 10047

The address family specified is not supported. This error is returned if the IPv6 address family was specified and the IPv6 stack is not installed on the local machine. This error is returned if the IPv4 address family was specified and the IPv4 stack is not installed on the local machine.

AddressNotAvailable AddressNotAvailable AddressNotAvailable AddressNotAvailable 10049

The selected IP address is not valid in this context.

AlreadyInProgress AlreadyInProgress AlreadyInProgress AlreadyInProgress 10037

The nonblocking Socket already has an operation in progress.

ConnectionAborted ConnectionAborted ConnectionAborted ConnectionAborted 10053

The connection was aborted by the .NET Framework or the underlying socket provider.

ConnectionRefused ConnectionRefused ConnectionRefused ConnectionRefused 10061

The remote host is actively refusing a connection.

ConnectionReset ConnectionReset ConnectionReset ConnectionReset 10054

The connection was reset by the remote peer.

DestinationAddressRequired DestinationAddressRequired DestinationAddressRequired DestinationAddressRequired 10039

A required address was omitted from an operation on a Socket.

Disconnecting Disconnecting Disconnecting Disconnecting 10101

A graceful shutdown is in progress.

Fault Fault Fault Fault 10014

An invalid pointer address was detected by the underlying socket provider.

HostDown HostDown HostDown HostDown 10064

The operation failed because the remote host is down.

HostNotFound HostNotFound HostNotFound HostNotFound 11001

No such host is known. The name is not an official host name or alias.

HostUnreachable HostUnreachable HostUnreachable HostUnreachable 10065

There is no network route to the specified host.

InProgress InProgress InProgress InProgress 10036

A blocking operation is in progress.

Interrupted Interrupted Interrupted Interrupted 10004

A blocking Socket call was canceled.

InvalidArgument InvalidArgument InvalidArgument InvalidArgument 10022

An invalid argument was supplied to a Socket member.

IOPending IOPending IOPending IOPending 997

The application has initiated an overlapped operation that cannot be completed immediately.

IsConnected IsConnected IsConnected IsConnected 10056

The Socket is already connected.

MessageSize MessageSize MessageSize MessageSize 10040

The datagram is too long.

NetworkDown NetworkDown NetworkDown NetworkDown 10050

The network is not available.

NetworkReset NetworkReset NetworkReset NetworkReset 10052

The application tried to set KeepAlive on a connection that has already timed out.

NetworkUnreachable NetworkUnreachable NetworkUnreachable NetworkUnreachable 10051

No route to the remote host exists.

NoBufferSpaceAvailable NoBufferSpaceAvailable NoBufferSpaceAvailable NoBufferSpaceAvailable 10055

No free buffer space is available for a Socket operation.

NoData NoData NoData NoData 11004

The requested name or IP address was not found on the name server.

NoRecovery NoRecovery NoRecovery NoRecovery 11003

The error is unrecoverable or the requested database cannot be located.

NotConnected NotConnected NotConnected NotConnected 10057

The application tried to send or receive data, and the Socket is not connected.

NotInitialized NotInitialized NotInitialized NotInitialized 10093

The underlying socket provider has not been initialized.

NotSocket NotSocket NotSocket NotSocket 10038

A Socket operation was attempted on a non-socket.

OperationAborted OperationAborted OperationAborted OperationAborted 995

The overlapped operation was aborted due to the closure of the Socket.

OperationNotSupported OperationNotSupported OperationNotSupported OperationNotSupported 10045

The address family is not supported by the protocol family.

ProcessLimit ProcessLimit ProcessLimit ProcessLimit 10067

Too many processes are using the underlying socket provider.

ProtocolFamilyNotSupported ProtocolFamilyNotSupported ProtocolFamilyNotSupported ProtocolFamilyNotSupported 10046

The protocol family is not implemented or has not been configured.

ProtocolNotSupported ProtocolNotSupported ProtocolNotSupported ProtocolNotSupported 10043

The protocol is not implemented or has not been configured.

ProtocolOption ProtocolOption ProtocolOption ProtocolOption 10042

An unknown, invalid, or unsupported option or level was used with a Socket.

ProtocolType ProtocolType ProtocolType ProtocolType 10041

The protocol type is incorrect for this Socket.

Shutdown Shutdown Shutdown Shutdown 10058

A request to send or receive data was disallowed because the Socket has already been closed.

SocketError SocketError SocketError -1

An unspecified Socket error has occurred.

SocketNotSupported SocketNotSupported SocketNotSupported SocketNotSupported 10044

The support for the specified socket type does not exist in this address family.

Success Success Success Success 0

The Socket operation succeeded.

SystemNotReady SystemNotReady SystemNotReady SystemNotReady 10091

The network subsystem is unavailable.

TimedOut TimedOut TimedOut TimedOut 10060

The connection attempt timed out, or the connected host has failed to respond.

TooManyOpenSockets TooManyOpenSockets TooManyOpenSockets TooManyOpenSockets 10024

There are too many open sockets in the underlying socket provider.

TryAgain TryAgain TryAgain TryAgain 11002

The name of the host could not be resolved. Try again later.

TypeNotFound TypeNotFound TypeNotFound TypeNotFound 10109

The specified class was not found.

VersionNotSupported VersionNotSupported VersionNotSupported VersionNotSupported 10092

The version of the underlying socket provider is out of range.

WouldBlock WouldBlock WouldBlock WouldBlock 10035

An operation on a nonblocking socket cannot be completed immediately.


Most of these errors are returned by the underlying socket provider.

Applies to