Using update site - ‘cannot connect to the repository’
Which update site did you use ? if you used what is documented at http://www.jboss.org/tools/download/installation/update_3_2.html then you seem to be behind a firewall that prevents installation ?
Offline installation using zip file - ‘operation cannot be completed, missing dependency’
Which dependency ? did you allow P2 to go look at other updatesites ?
Add a link file in the dropins folder in eclipse - Didn’t recognize JBoss portlet
Copy paste all features and plugin from JBoss Tools zip to eclipse features and plugins.
Both of these are bound to result in a broken eclipse installation so just don't do that
You do know that you can simply install Eclipse Helios, goto Help > Eclipse Marketplace and choose jboss tools helios from there ?
Then the base jboss tools gets installed and you can install additional things from update ui after that.
Of course that won't work if your firewall is somehow blocking installations/access to our HTTP updatesite.