The Web Proxy Server 4.0.x agent is supported on these platforms:
Solaris OS on SPARC platforms, versions 9 and 10 (32–bit systems)
Solaris OS on x86 platforms, versions 9 and 10 (32–bit systems)
Red Hat Enterprise Linux Advanced Server 4.0 and 5.0 (32–bit systems)
Windows 2003, Enterprise Edition (32–bit systems)
Windows 2003, Standard Edition (32–bit systems)