I've been working on this very frustration Sametime Standard deployment and I'm at the very end phase, and I can't get the network install files to work correctly. I can run the standalone client and things are fine.
I've actually narrowed it down to not being able to use an HTTPS URL as defined in my download.properties file, I can switch to HTTP, and the install works perfectly.
OK, so the problem is HTTPS right? Probably, but I can't figure out where. I'm using a wildcard cert purchased from Netsol, and I can browse to files in the same path no issue, so I really can't see the problem here.
I clued into using http instead of https because of the following error in the install log
Unable to access site: "https://stweb.company.com/sametime/network-install/install.win/updateSite
ion: SSLContext Default implementation not found: ] **I've but in bogus hostname info...
I can use a browser to access https://stweb.company.com/sametime/network-install/install.win/updateSite/site.xml
I can view the SSL cert and it looks normal.
I'm including the full log for your perusing enjoyment, hostnames also muddled.