https://www.secureblackbox.com/kb/help/ref_err_sshtunnelerrorcodes.html
| Copyright www.secureblackbox.com | Value | Description |
| SSH_TUNNEL_ERROR_FORWARD_DISALLOWED | 1 (0x0001) | Forwarding is unallowable |
| SSH_TUNNEL_ERROR_SERVER_ERROR | 2 (0x0002) | Tunnel opening is rejected |
| SSH_TUNNEL_ERROR_ADMINISTRATIVELY_PROHIBITED | 1 (0x0001) | Forwarding is unallowable |
| SSH_TUNNEL_ERROR_CONNECT_FAILED | 2 (0x0002) | Tunnel opening is rejected |
| SSH_TUNNEL_ERROR_UNKNOWN_CHANNEL_TYPE | 3 (0x0003) | Type of requested tunnel is unknown |
| SSH_TUNNEL_ERROR_RESOURCE_SHORTAGE | 4 (0x0004) | Resource became unavailable while trying to connect |
| SSH_TUNNEL_ERROR_ALREADY_CONNECTED | 700 (0x02BC) | Tunnel is already opened |
| SSH_TUNNEL_ERROR_NOT_BOUND_TO_SSH_CLASS | 701 (0x02BD) | Tunnel is not bound to SSH-class (via TElSSHTunnelList object) |
| SSH_TUNNEL_ERROR_SSH_NOT_CONNECTED | 702 (0x02BE) | Attempt to open tunnel while SSH-connection is not established |
| SSH_TUNNEL_ERROR_UNSUPPORTED_BY_SSH_VERSION | 703 (0x02BF) | Tunnel is not supported by SSH-version (for example SFTPv1) |
| SSH_TUNNEL_ERROR_UNSUPPORTED_ACTION | 704 (0x02C0) | Attempt to perform unsupported action |
| SSH_TUNNEL_ERROR_OPEN_FAILED | 705 (0x02C1) | Tunnel opening failed |
