iSCSI Error Codes and descriptions from iSCSIErr.h

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0xEFFF0001L : ISDSC_NON_SPECIFIC_ERROR       
A non specific error occurred.

0xEFFF0002L : ISDSC_LOGIN_FAILED             
Login Failed.

0xEFFF0003L : ISDSC_CONNECTION_FAILED        
Connection Failed.

0xEFFF0004L : ISDSC_INITIATOR_NODE_ALREADY_EXISTS
Initiator Node Already Exists.

0xEFFF0005L : ISDSC_INITIATOR_NODE_NOT_FOUND 
Initiator Node Does Not Exist.

0xEFFF0006L : ISDSC_TARGET_MOVED_TEMPORARILY 
Target Moved Temporarily.

0xEFFF0007L : ISDSC_TARGET_MOVED_PERMANENTLY 
Target Moved Permanently.

0xEFFF0008L : ISDSC_INITIATOR_ERROR          
Initiator Error.

0xEFFF0009L : ISDSC_AUTHENTICATION_FAILURE   
Authentication Failure.

0xEFFF000AL : ISDSC_AUTHORIZATION_FAILURE    
Authorization Failure.

0xEFFF000BL : ISDSC_NOT_FOUND                
Not Found.

0xEFFF000CL : ISDSC_TARGET_REMOVED           
Target Removed.

0xEFFF000DL : ISDSC_UNSUPPORTED_VERSION      
Unsupported Version.

0xEFFF000EL : ISDSC_TOO_MANY_CONNECTIONS     
Too many Connections.

0xEFFF000FL : ISDSC_MISSING_PARAMETER        
Missing Parameter.

0xEFFF0010L : ISDSC_CANT_INCLUDE_IN_SESSION  
Can not include in session.

0xEFFF0011L : ISDSC_SESSION_TYPE_NOT_SUPPORTED
Session type not supported.

0xEFFF0012L : ISDSC_TARGET_ERROR             
Target Error.

0xEFFF0013L : ISDSC_SERVICE_UNAVAILABLE
Service Unavailable.

0xEFFF0014L : ISDSC_OUT_OF_RESOURCES         
Out of Resources.

0xEFFF0015L : ISDSC_CONNECTION_ALREADY_EXISTS
Connections already exist on initiator node.

0xEFFF0016L : ISDSC_SESSION_ALREADY_EXISTS   
Session Already Exists.

0xEFFF0017L : ISDSC_INITIATOR_INSTANCE_NOT_FOUND
Initiator Instance Does Not Exist.

0xEFFF0018L : ISDSC_TARGET_ALREADY_EXISTS    
Target Already Exists.

0xEFFF0019L : ISDSC_DRIVER_BUG
The iscsi driver implementation did not complete an operation correctly.

0xEFFF001AL : ISDSC_INVALID_TEXT_KEY         
An invalid key text was encountered.

0xEFFF001BL : ISDSC_INVALID_SENDTARGETS_TEXT 
Invalid SendTargets response text was encountered.

0xEFFF001CL : ISDSC_INVALID_SESSION_ID       
Invalid Session Id.

0xEFFF001DL : ISDSC_SCSI_REQUEST_FAILED      
The scsi request failed.

0xEFFF001EL : ISDSC_TOO_MANY_SESSIONS        
Exceeded max sessions for this initiator.

0xEFFF001FL : ISDSC_SESSION_BUSY
Session is busy since a request is already in progress.

0xEFFF0020L : ISDSC_TARGET_MAPPING_UNAVAILABLE
The target mapping requested is not available.

0xEFFF0021L : ISDSC_ADDRESS_TYPE_NOT_SUPPORTED
The Target Address type given is not supported.

0xEFFF0022L : ISDSC_LOGON_FAILED             
Logon Failed.

0xEFFF0023L : ISDSC_SEND_FAILED              
TCP Send Failed.

0xEFFF0024L : ISDSC_TRANSPORT_ERROR          
TCP Transport Error

0xEFFF0025L : ISDSC_VERSION_MISMATCH         
iSCSI Version Mismatch

0xEFFF0026L : ISDSC_TARGET_MAPPING_OUT_OF_RANGE
The Target Mapping Address passed is out of range for the adapter configuration.

0xEFFF0027L : ISDSC_TARGET_PRESHAREDKEY_UNAVAILABLE
The preshared key for the target or IKE identification payload is not available.

0xEFFF0028L : ISDSC_TARGET_AUTHINFO_UNAVAILABLE
The authentication information for the target is not available.

0xEFFF0029L : ISDSC_TARGET_NOT_FOUND         
The target name is not found or is marked as hidden from login.

0xEFFF002AL : ISDSC_LOGIN_USER_INFO_BAD
One or more parameters specified in LoginTargetIN structure is invalid.

0xEFFF002BL : ISDSC_TARGET_MAPPING_EXISTS    
Given target mapping already exists.

0xEFFF002CL : ISDSC_HBA_SECURITY_CACHE_FULL
The HBA security information cache is full.

0xEFFF002DL : ISDSC_INVALID_PORT_NUMBER
The port number passed is not valid for the initiator.

0xAFFF002EL : ISDSC_OPERATION_NOT_ALL_SUCCESS
The operation was not successful for all initiators or discovery methods.

0xEFFF002FL : ISDSC_HBA_SECURITY_CACHE_NOT_SUPPORTED
The HBA security information cache is not supported by this adapter.

0xEFFF0030L : ISDSC_IKE_ID_PAYLOAD_TYPE_NOT_SUPPORTED
The IKE id payload type specified is not supported.

0xEFFF0031L : ISDSC_IKE_ID_PAYLOAD_INCORRECT_SIZE
The IKE id payload size specified is not correct.

0xEFFF0032L : ISDSC_TARGET_PORTAL_ALREADY_EXISTS
Target Portal Structure Already Exists.

0xEFFF0033L : ISDSC_TARGET_ADDRESS_ALREADY_EXISTS
Target Address Structure Already Exists.

0xEFFF0034L : ISDSC_NO_AUTH_INFO_AVAILABLE
There is no IKE authentication information available.

0xEFFF0035L : ISDSC_NO_TUNNEL_OUTER_MODE_ADDRESS
There is no tunnel mode outer address specified.

0xEFFF0036L : ISDSC_CACHE_CORRUPTED          
Authentication or tunnel address cache is corrupted.

0xEFFF0037L : ISDSC_REQUEST_NOT_SUPPORTED    
The request or operation is not supported.

0xEFFF0038L : ISDSC_TARGET_OUT_OF_RESORCES   
The target does not have enough resources to process the given request.

0xEFFF0039L : ISDSC_SERVICE_DID_NOT_RESPOND  
The initiator service did not respond to the request sent by the driver.

0xEFFF003AL : ISDSC_ISNS_SERVER_NOT_FOUND    
The Internet Storage Name Server (iSNS) server was not found or is unavailable.

0xAFFF003BL : ISDSC_OPERATION_REQUIRES_REBOOT
The operation was successful but requires a driver reload or reboot to become effective.

0xEFFF003CL : ISDSC_NO_PORTAL_SPECIFIED      
There is no target portal available to complete the login.

0xEFFF003DL : ISDSC_CANT_REMOVE_LAST_CONNECTION
Cannot remove the last connection for a session.

0xEFFF003EL : ISDSC_SERVICE_NOT_RUNNING      
The Microsoft iSCSI initiator service has not been started.

0xEFFF003FL : ISDSC_TARGET_ALREADY_LOGGED_IN 
The target has already been logged in via an iSCSI session.

0xEFFF0040L : ISDSC_DEVICE_BUSY_ON_SESSION
The session cannot be logged out since a device on that session is currently being used.

0xEFFF0041L : ISDSC_COULD_NOT_SAVE_PERSISTENT_LOGIN_DATA
Failed to save persistent login information.

0xEFFF0042L : ISDSC_COULD_NOT_REMOVE_PERSISTENT_LOGIN_DATA
Failed to remove persistent login information.

0xEFFF0043L : ISDSC_PORTAL_NOT_FOUND         
The specified portal was not found.

0xEFFF0044L : ISDSC_INITIATOR_NOT_FOUND      
The specified initiator name was not found.

0xEFFF0045L : ISDSC_DISCOVERY_MECHANISM_NOT_FOUND
The specified discovery mechanism was not found.

0xEFFF0046L : ISDSC_IPSEC_NOT_SUPPORTED_ON_OS
iSCSI does not support IPSEC for this version of the OS.

0xEFFF0047L : ISDSC_PERSISTENT_LOGIN_TIMEOUT 
The iSCSI service timed out waiting for all persistent logins to complete.

0xAFFF0048L : ISDSC_SHORT_CHAP_SECRET        
The specified CHAP secret is less than 96 bits and will not be usable for authenticating over non ipsec connections.

0xEFFF0049L : ISDSC_EVALUATION_PEROID_EXPIRED
The evaluation period for the iSCSI initiator service has expired.

0xEFFF004AL : ISDSC_INVALID_CHAP_SECRET      
CHAP secret given does not conform to the standard. Please see system event log for more information.

0xEFFF004BL : ISDSC_INVALID_TARGET_CHAP_SECRET
Target CHAP secret given is invalid. Maximum size of CHAP secret is 16 bytes. Minimum size is 12 bytes if IPSec is not used.

0xEFFF004CL : ISDSC_INVALID_INITIATOR_CHAP_SECRET
Initiator CHAP secret given is invalid. Maximum size of CHAP secret is 16 bytes. Minimum size is 12 bytes if IPSec is not used.

0xEFFF004DL : ISDSC_INVALID_CHAP_USER_NAME   
CHAP Username given is invalid.

0xEFFF004EL : ISDSC_INVALID_LOGON_AUTH_TYPE  
Logon Authentication type given is invalid.

0xEFFF004FL : ISDSC_INVALID_TARGET_MAPPING   
Target Mapping information given is invalid.

0xEFFF0050L : ISDSC_INVALID_TARGET_ID        
Target Id given in Target Mapping is invalid.

0xEFFF0051L : ISDSC_INVALID_ISCSI_NAME       
The iSCSI name specified contains invalid characters or is too long.

0xEFFF0052L : ISDSC_INCOMPATIBLE_ISNS_VERSION
The version number returned from the Internet Storage Name Server (iSNS) server is not compatible with this version of the iSNS client.

0xEFFF0053L : ISDSC_FAILED_TO_CONFIGURE_IPSEC
Initiator failed to configure IPSec for the given connection. This could be because of low resources.

0xEFFF0054L : ISDSC_BUFFER_TOO_SMALL
The buffer given for processing the request is too small.

0xEFFF0055L : ISDSC_INVALID_LOAD_BALANCE_POLICY
The given Load Balance policy is not recognized by iScsi initiator.

0xEFFF0056L : ISDSC_INVALID_PARAMETER        
One or more paramaters specified is not valid.

0xEFFF0057L : ISDSC_DUPLICATE_PATH_SPECIFIED 
Duplicate PathIds were specified in the call to set Load Balance Policy.

0xEFFF0058L : ISDSC_PATH_COUNT_MISMATCH      
Number of paths specified in Set Load Balance Policy does not match the number of paths to the target.

0xEFFF0059L : ISDSC_INVALID_PATH_ID          
Path Id specified in the call to set Load Balance Policy is not valid

0xEFFF005AL : ISDSC_MULTIPLE_PRIMARY_PATHS_SPECIFIED
Multiple primary paths specified when only one primary path is expected.

0xEFFF005BL : ISDSC_NO_PRIMARY_PATH_SPECIFIED
No primary path specified when at least one is expected.

0xEFFF005CL : ISDSC_DEVICE_ALREADY_PERSISTENTLY_BOUND
Device is already a persistently bound device.

0xEFFF005DL : ISDSC_DEVICE_NOT_FOUND         
Device was not found.

0xEFFF005EL : ISDSC_DEVICE_NOT_ISCSI_OR_PERSISTENT
The device specified does not originate from an iSCSI disk or a persistent iSCSI login.

0xEFFF005FL : ISDSC_DNS_NAME_UNRESOLVED      
The DNS name specified was not resolved.

0xEFFF0060L : ISDSC_NO_CONNECTION_AVAILABLE
There is no connection available in the iSCSI session to process the request.

0xEFFF0061L : ISDSC_LB_POLICY_NOT_SUPPORTED
The given Load Balance policy is not supported.

0xEFFF0062L : ISDSC_REMOVE_CONNECTION_IN_PROGRESS
A remove connection request is already in progress for this session.

0xEFFF0063L : ISDSC_INVALID_CONNECTION_ID    
Given connection was not found in the session.

0xEFFF0064L : ISDSC_CANNOT_REMOVE_LEADING_CONNECTION
The leading connection in the session cannot be removed.

0xEFFF0065L : ISDSC_RESTRICTED_BY_GROUP_POLICY
The operation cannot be performed since it does not conform with the group policy assigned to this computer.

0xEFFF0066L : ISDSC_ISNS_FIREWALL_BLOCKED
The operation cannot be performed since the Internet Storage Name Server (iSNS) firewall exception has not been enabled.