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SocketError Enum


Defines error codes for the Socket class.

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


AccessDenied 10013

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

AddressAlreadyInUse 10048

Only one use of an address is normally permitted.

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 10049

The selected IP address is not valid in this context.

AlreadyInProgress 10037

The nonblocking Socket already has an operation in progress.

ConnectionAborted 10053

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

ConnectionRefused 10061

The remote host is actively refusing a connection.

ConnectionReset 10054

The connection was reset by the remote peer.

DestinationAddressRequired 10039

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

Disconnecting 10101

A graceful shutdown is in progress.

Fault 10014

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

HostDown 10064

The operation failed because the remote host is down.

HostNotFound 11001

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

HostUnreachable 10065

There is no network route to the specified host.

InProgress 10036

A blocking operation is in progress.

Interrupted 10004

A blocking Socket call was canceled.

InvalidArgument 10022

An invalid argument was supplied to a Socket member.

IOPending 997

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

IsConnected 10056

The Socket is already connected.

MessageSize 10040

The datagram is too long.

NetworkDown 10050

The network is not available.

NetworkReset 10052

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

NetworkUnreachable 10051

No route to the remote host exists.

NoBufferSpaceAvailable 10055

No free buffer space is available for a Socket operation.

NoData 11004

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

NoRecovery 11003

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

NotConnected 10057

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

NotInitialized 10093

The underlying socket provider has not been initialized.

NotSocket 10038

A Socket operation was attempted on a non-socket.

OperationAborted 995

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

OperationNotSupported 10045

The address family is not supported by the protocol family.

ProcessLimit 10067

Too many processes are using the underlying socket provider.

ProtocolFamilyNotSupported 10046

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

ProtocolNotSupported 10043

The protocol is not implemented or has not been configured.

ProtocolOption 10042

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

ProtocolType 10041

The protocol type is incorrect for this Socket.

Shutdown 10058

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

SocketError -1

An unspecified Socket error has occurred.

SocketNotSupported 10044

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

Success 0

The Socket operation succeeded.

SystemNotReady 10091

The network subsystem is unavailable.

TimedOut 10060

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

TooManyOpenSockets 10024

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

TryAgain 11002

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

TypeNotFound 10109

The specified class was not found.

VersionNotSupported 10092

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

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