When a ProxySG processes an SSL transaction between a client and a content server, does the ProxySG function as an SSL client or as an SSL server?

In the context of SSL transactions involving a ProxySG, it acts as an SSL client when initiating a connection to the content server. When a client makes a request that involves SSL/TLS, the ProxySG will establish an SSL connection with the content server on behalf of the client. This involves the ProxySG acting as a client in the communication chain with the server.

During this process, the ProxySG will send a Client Hello message to the content server to begin the SSL handshake, indicating that it is indeed functioning as the SSL client. It will also handle the negotiation of encryption parameters, certificates, and the establishment of a secure session with the server.

This role is essential for accomplishing several tasks, including performing SSL decryption to inspect or filter traffic and then re-encrypting the traffic before sending it back to the original client. Thus, understanding the role of the ProxySG as an SSL client highlights its capability to manage secure connections and enforce security policies effectively.