Hi!
Basically you have to logon to your box (telnet/ssh) and get the jhead file downloaded and located somewhere in your account. Then run the config wizard again, providing the path to the jhead executable (The file MUST be in executable form) and that's it.
One way of getting the file to your account is to use an ftp app while logged on your shell, or possibly using wget. I don't know squat about solaris, so which commands that are available to you I dont know.