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KB-10523: Radius Authentication does not work with FIPS-enabled connector host

Privileged Access Service ,  

19 April,20 at 03:42 AM


Radius authentication does not work with FIPS-enabled Connector host. This includes both Connector as a Radius Server feature and Connector as a Radius Client feature.

E.g. MFA login to Windows client and cloud using radius server authentication (RSA) failed, giving the following error:

'Authentication (login or challenge) has failed. Please try again or contact your system administrator.'

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Cloud connector log displayed the following exception:

'System.InvalidOperationException: This implementation is not part of the Windows Platform FIPS validated cryptographic algorithms.
at System.Security.Cryptography.MD5CryptoServiceProvider..ctor()


Centrify Radius authentication uses the Radius.Net library, which protects the user's password using MD5. MD5 is not FIPS compliant, hence the exception.


The workaround is to disable FIPS on the connector host. The steps are:

1. Launch regedit.exe

2. Navigate to HKEY_LOCAL_MACHINE > SYSTEM > CurrentControlSet > Control > Lsa > FipsAlgorithmPolicy

3. Disable FIPS-compliant encryption on cloud connector by setting FipsAlgorithmPolicy to 0

4. Test on Radius authentication again

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