Extensible Authentication Protocol (EAP) 2014-01-24 2026-03-05 Specification Required Margaret Cullen, Nancy Cam-Winget 0 Unassigned 1 Authority-ID TLV 2 Identity-Type TLV 3 Result TLV 4 NAK TLV 5 Error TLV 6 Channel-Binding TLV 7 Vendor-Specific TLV 8 Request-Action TLV 9 EAP-Payload TLV 10 Intermediate-Result TLV 11 PAC TLV (DEPRECATED) 12 Crypto-Binding TLV 13 Basic-Password-Auth-Req TLV 14 Basic-Password-Auth-Resp TLV 15 PKCS#7 TLV 16 PKCS#10 TLV 17 Trusted-Server-Root TLV 18 CSR-Attributes TLV 19 Identity-Hint TLV 20-16383 Unassigned Specification Required Unassigned 0 Unassigned 1 User 2 Machine 3-65535 Unassigned Specification Required Unassigned 0 Unassigned 1 Success 2 Failure 3-255 Unassigned Specification Required Margaret Cullen, Nancy Cam-Winget 0 Unassigned 1 User account expires soon 2 User account credential expires soon 3 User account authorizations change soon 4 Clock skew detected 5 Contact administrator 6 User account credentials change required 7-1000 Unassigned 1001 Inner Method Error 1002 Unspecified authentication infrastructure problem 1003 Unspecified authentication failure 1004 Unspecified authorization failure 1005 User account credentials unavailable 1006 User account expired 1007 User account locked: try again later 1008 User account locked: admin intervention required 1009 Authentication infrastructure unavailable 1010 Authentication infrastructure not trusted 1011 Clock skew too great 1012 Invalid inner realm 1013 Token out of sync: administrator intervention required 1014 Token out of sync: PIN change required 1015 Token revoked 1016 Tokens exhausted 1017 Challenge expired 1018 Challenge algorithm mismatch 1019 Client certificate not supplied 1020 Client certificate rejected 1021 Realm mismatch between inner and outer identity 1022 Unsupported Algorithm In Certificate Signing Request 1023 Unsupported Extension In Certificate Signing Request 1024 Bad Identity in Certificate Signing Request 1025 Bad Certificate Signing Request 1026 Internal CA Error 1027 General PKI Error 1028 Inner method's channel-binding data required but not supplied 1029 Inner method's channel-binding data did not include required information 1030 Inner method's channel binding data failed 1031 User account credentials incorrect [USAGE NOT RECOMMENDED] 1032 Inner method not supported 1033-2000 Unassigned 2001 Tunnel Compromise Error 2002 Unexpected TLVs Exchanged 2003 The Crypto-Binding TLV is invalid (Version, or Received-Ver, or Sub-Type) 2004 The first Inner Method did not derive EMSK 2005 The Crypto-Binding TLV did not include a required MSK Compound MAC 2006 The MSK Compound MAC fails verification 2007 The Crypto-Binding TLV did not include a required EMSK Compound MAC 2008 The EMSK Compound MAC fails verification 2009 The EMSK Compound MAC exists, but the Inner Method did not derive EMSK 2010-4294967295 Unassigned Specification Required Unassigned 0 Unassigned 1 Process-TLV 2 Negotiate-EAP 3-255 Unassigned Registry closed This registry has been closed. See . 0 Unassigned 1 PAC-Key 2 PAC-Opaque 3 PAC-Lifetime 4 A-ID 5 I-ID 6 Reserved 7 A-ID-Info 8 PAC-Acknowledgement 9 PAC-Info 10 PAC-Type 11-65535 Unassigned Registry closed This registry has been closed. See . 0 Unassigned 1 Tunnel PAC 2-65535 Unassigned Specification Required Unassigned 0 Unassigned 1 PKCS#7-Server-Certificate-Root 2-65535 Unassigned