logon security - when upgrade to ecc6.0

Hi,

we are upgrading to Ecc6.0 from 4.6C. Got a question for the logon screen security. In 4.6 the external parties used a logon and was authenticated by standalone its server before it was authenticated by SAP. Now since the logon is within SAP, we do not want external parties to directly logon into R/3.

Any suggestions as to how to keep proceed?

regards,

Anand