ErrAddressNotFound occurs when network address of fd could not be found.

ErrConnectionAlreadyClosed when trying to close already closed connection.

ErrConnectionAlreadyClosed when trying to work with closed connection.

ErrConnectionQueueIsNil occurs when trying to access connection queue that is not initialized.

ErrGettingSQE occurs when SQE could not be obtained.

ErrInvalidState occurs when operation is called in invalid state.

ErrInvalidTimeDuration occure when specyfied time duration is not valid.

ErrIsEmpty indicates that data holder, data magazine or buffer is empty.

ErrNoIPv4AddressOnInterface occurs when an IPv4 multicast address is set on an interface but IPv4 is not configured.

ErrNotSupported occurs when not supported feature is used.

ErrOpNotAvailableInMode occurs when trying to run operation that is not available in current mode.

ErrServerAlreadyRunning occurs when trying to start already running server.

ErrSkippable indicates an error that can be skipped and not handled as an usual flow breaking error.

ErrUnknownConnectionState occurs when connection state is unknown.

ErrUnsupportedProtocol occurs when trying to use protocol that is not supported.

ErrUnsupportedTCPProtocol occurs when trying to use an unsupported TCP protocol.

ErrUnsupportedUDPProtocol occurs when trying to use an unsupported UDP protocol.