If you are unable to complete the installation or if you get a failed status for the installation of Web Proxy Server, follow these steps.
Collect the general system information as explained in To Collect Required Debug Data for Any Web Proxy Server Problem.
Specify if this is a first-time installation or a Hot Fix installation on a pre-existing Web Proxy Server instance.
Get the installation logs.
Rerun the installation with the following command and save the resultant file.
truss -ealf -rall -wall -vall -o /tmp/install-proxy.truss ./ns-setup
tusc -v -feaIT -rall -wall -o /tmp/install-proxy.tusc.out ./ns-setup
strace -fv -o /tmp/install-proxy.strace.out ./setup
Use Debug View: http://www.sysinternals.com/Utilities/DebugView.html