4
SSH_DISCONNECT_RESERVED
DisconnectRFC 4253 §11.1
SSH_DISCONNECT_RESERVED (4) is a reserved disconnect code in RFC 4253 §11.1. It has no defined meaning and should not be sent by implementations. It exists as a placeholder in the numbering scheme. If received, treat it as an unspecified disconnect.
Code
4
Category
Disconnect
Standard
RFC 4253 §11.1
Description
Code 4 is reserved in the RFC 4253 disconnect code table and has no assigned semantic meaning. Standards-compliant SSH implementations do not send this code. If a disconnect message with reason code 4 is received, the implementation should treat the disconnect as occurring without a specific reason.
The description string in the SSH_MSG_DISCONNECT message may provide human-readable context when a non-standard code like 4 is received.
Common Causes
- –Non-standard SSH implementation sending reserved code
- –Protocol implementation bug using code 4 instead of a valid code