I am wondering if there is a FIPS compliant solution for authenticating with a RADIUS server via .NET , such as http://code.google.com/p/radius-net/source/browse/trunk/radius-net/src/?r=4
The problem with the linked one that makes it not compliant with FIPS is the use of MD5, which is not a secure algorithm according to this standard.
MD5 makes the whole RADIUS protocol non-compliant, not just one particular client.
There is no such thing as a FIPS-compliant implementation of an algorithm that isn't FIPS-compliant.
And you've been told this before: Override MD5 to make it FIPS validated?