You need to provide more information than "it's not working on the server I installed it on" since that, alone, doesn't give any useful info.
Does squid start on the 41 box? What versions of squid are you using? Are you wanting to make the 42 box a cache peer to the 41 box? There is a LOT of great information on configuring squid on the squid website
. There is online doc there that describes various squid configurations and yours might be covered there.
If you are getting any errors from squid on the 41 box, post them so we can see what's up. If the connection between the squid proxy on 42 and on 41 isn't working, I suggest reading over the doc on the squid site to see if you have both proxies setup correctly.
Did you build squid on the 41 box from source or did you install a pre-built RPM or something?