Table: RADIUS CoA Message [101] Error-Cause values provides an overview of the [101] Error-Cause attribute values as defined in RFC 5176 and lists if they are generated in SR OS.
| Code | CoA Error Cause | Description | 
                                 SR OS  | 
                        
|---|---|---|---|
| 
                                 201  | 
                            
                                 Residual Session Context Removed  | 
                            
                                 Residual Session Context Removed is sent in response to a Disconnect-Request if one or more user sessions are no longer active, but residual session context was found and successfully removed. This value is only sent within a Disconnect-ACK and must not be sent within a CoA-ACK, Disconnect-NAK, or CoA-NAK.  | 
                            |
| 
                                 202  | 
                            
                                 Invalid EAP Packet (Ignored)  | 
                            
                                 Invalid EAP Packet (Ignored) is a non-fatal error that must not be sent by implementations of this specification.  | 
                            |
| 
                                 401  | 
                            
                                 Unsupported Attribute  | 
                            
                                 Unsupported Attribute is a fatal error sent if a Request contains an attribute (such as a Vendor-Specific or EAP-Message Attribute) that is not supported.  | 
                            |
| 
                                 402  | 
                            
                                 Missing Attribute  | 
                            
                                 Missing Attribute is a fatal error sent if critical attributes (such as NAS or session identification attributes) are missing from a Request.  | 
                            
                                 ✓  | 
                        
| 
                                 403  | 
                            
                                 NAS Identification Mismatch  | 
                            
                                 NAS Identification Mismatch is a fatal error sent if one or more NAS identification attributes do not match the identity of the NAS receiving the Request.  | 
                            
                                 ✓  | 
                        
| 
                                 404  | 
                            
                                 Invalid Request  | 
                            
                                 Invalid Request is a fatal error sent if some other aspect of the Request is invalid, such as if one or more attributes (such as EAP-Message Attributes) are not formatted properly.  | 
                            
                                 ✓  | 
                        
| 
                                 405  | 
                            
                                 Unsupported Service  | 
                            
                                 Unsupported Service is a fatal error sent if a Service-Type Attribute included with the Request is sent with an invalid or unsupported value. This error cannot be sent in response to a Disconnect-Request.  | 
                            
                                 ✓  | 
                        
| 
                                 406  | 
                            
                                 Unsupported Extension  | 
                            
                                 Unsupported Extension is a fatal error sent because of a lack of support for an extension such as Disconnect and, or CoA packets. This is typically be sent by a proxy receiving an ICMP port unreachable message after attempting to forward a CoA-Request or Disconnect-Request to the NAS.  | 
                            |
| 
                                 407  | 
                            
                                 Invalid Attribute Value  | 
                            
                                 Invalid Attribute Value is a fatal error sent if a CoA-Request or Disconnect-Request contains an attribute with an unsupported value.  | 
                            
                                 ✓  | 
                        
| 
                                 501  | 
                            
                                 Administratively Prohibited  | 
                            
                                 Administratively Prohibited is a fatal error sent if the NAS is configured to prohibit honoring of CoA-Request or Disconnect-Request packets for the specified session.  | 
                            
                                 ✓  | 
                        
| 
                                 502  | 
                            
                                 Request Not Routable (Proxy)  | 
                            
                                 Request Not Routable is a fatal error that may be sent by a proxy and must not be sent by a NAS. It indicates that the proxy was unable to determine how to route a CoA-Request or Disconnect-Request to the NAS. Example, this can occur if the required entries are not present in the proxy's realm routing table.  | 
                            |
| 
                                 503  | 
                            
                                 Session Context Not Found  | 
                            
                                 Session Context Not Found is a fatal error sent if the session context identified in the CoA-Request or Disconnect-Request does not exist on the NAS.  | 
                            
                                 ✓  | 
                        
| 
                                 504  | 
                            
                                 Session Context Not Removable  | 
                            
                                 Session Context Not Removable is a fatal error sent in response to a Disconnect-Request if the NAS was able to locate the session context, but could not remove it for some reason. It must not be sent within a CoA-ACK, CoA-NAK, or Disconnect-ACK, only within a Disconnect-NAK.  | 
                            |
| 
                                 505  | 
                            
                                 Other Proxy Processing Error  | 
                            
                                 Other Proxy Processing Error is a fatal error sent in response to a CoA or Disconnect-Request that could not be processed by a proxy, for reasons other than routing.  | 
                            |
| 
                                 506  | 
                            
                                 Resources Unavailable  | 
                            
                                 Resources Unavailable is a fatal error sent when a CoA or Disconnect-Request could not be honored because of a lack of available NAS resources (memory, non-volatile storage, and so on).  | 
                            
                                 ✓  | 
                        
| 
                                 507  | 
                            
                                 Request Initiated  | 
                            
                                 Request Initiated is a fatal error sent by a NAS in response to a CoA-Request including a Service-Type Attribute with a value of Authorize Only. It indicates that the CoA-Request has not been honored, but that the NAS is sending one or more RADIUS Access-Requests including a Service-Type Attribute with value Authorize Only to the RADIUS server.  | 
                            |
| 
                                 508  | 
                            
                                 Multiple Session Selection Unsupported  | 
                            
                                 Multiple Session Selection Unsupported is a fatal error sent by a NAS in response to a CoA-Request or Disconnect-Request whose session identification attributes match multiple sessions, where the NAS does not support Requests applying to multiple sessions.  | 
                            
Table: RADIUS Disconnect Message [101] Error-Cause values for IPsec tunnel lists the possible [101] Error-Cause attribute values generated in the SR OS in response to a Disconnect Message targeting an IPsec tunnel.
| Code | CoA Error Cause | Description | 
|---|---|---|
| 
                                 404  | 
                            
                                 Invalid Request  | 
                            
                                 A fatal error sent if some other aspect of the Disconnect-Request is invalid, such as multiple tunnel identifications present in the request.  | 
                        
| 
                                 503  | 
                            
                                 Session Context Not Found  | 
                            
                                 A fatal error sent if the tunnel identified in the Disconnect-Request does not exist.  | 
                        
| 
                                 504  | 
                            
                                 Session Context Not Removable  | 
                            
                                 A fatal error sent if all identified tunnels belong to a tunnel group in MC-IPsec standby status.  |