The following enhancements have been made in recent releases of Proxy Server:
You can connect to an IPv6 enabled website through the Proxy Server 4.0.6. Proxy server also supports ftp extension for ipv6 in default (passive) mode.
Proxy Server 4.0.6 supports Network Security Services (NSS) 3.11.7 and Netscape Portable Runtime (NSPR) 4.6.4.
From Proxy Server 4.0.2 release, the installer supports the upgrade of an existing Proxy Server 4.0 installation to the later version. For the Java Enterprise System installations of Proxy Server 4.0.1, you need to install the patches that correspond to the later release.
This version of Proxy introduces the support for Extended Passive (EPSV) mode instead of Passive Mode only (as per RFC 2428).
Proxy Server 4.0.6 provides hardware accelerator support for SunTM Crypto Accelerator 6000, a cryptographic accelerator board that enhances the performance of SSL on the Proxy Server.