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IAS related Event ID and IAS Reason Codes

Most Windows IAS Event ID errors are related to security and permission issues. Review the security or permission settings first.

Event ID 2: Reason-Code = 8
Event ID 2 with Reason-Code = 16
Event ID 2 with Reason-Code = 18
Event ID 2 Reason-Code = 22 and 97
Event ID 2: IAS Reason-Code = 48
Event ID 2  Reason-Code = 49
Event ID 2: Reason-Code = 66
Event ID 2 with reason code 70
Event ID 2 with reason-code = 262
Event ID 3: IAS Reason-Code = 5
Event ID 13: RADIUS message was received from invalid client
Event ID 18: authenticator attribute that is not valid

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