Your Rule Base includes a Client Authentication rule, using partial authentication and standard sign-on for HTTP, Telnet, and FTP services. The rule was working, until this morning. Now users are not prompted for authentication, and they see error page cannot be displayed in the browser. In SmartView Tracker, you discover the HTTP connection is dropped when the Gateway is the destination. What did you do to cause Client Authentication to fail?

A.
disabled R75 Control Connections in Global Properties

B.
enabled Static NAT on the problematic machines

C.
added a rule below the Client Authentication rule, blocking HTTP from the internal network

D.
added the Stealth Rule before the Client Authentication rule