ADFS Authentification

Hello everyone,

i hope i choose the right Forum.

I have a Windows Server 2012 R2 with an ADFS and DIRSync.

The test ADFS Server (without WAP) has activated the FBA and WIA.

Every time I connect from the Internet or intranet the adfs choose the WIA and not the FBA.

I test it with a non-domain-joined Server.

How does the ADFS decide which autentification is to use?

Thanks