The _errno code for the error which triggered the event.
This property function may only be called if Event.type is either bindFailed, acceptFailed, closeFailed or handshakeFailedNoDetail.
Error if the property is called for a wrong event type.
See Implementation
The _errno code for the error which triggered the event.
This property function may only be called if Event.type is either bindFailed, acceptFailed, closeFailed or handshakeFailedNoDetail.