About chatzilla on the Proxy Server

For more information about how to use chatzilla on a proxy server-Linux general technology-Linux technology and application, see the following. My brother company installed a proxy server and installed firefox6.0.1 on my computer. After installing chatzilla, I found that I could not connect to the chat room normally, I have entered http in the Proxy Type of Connection in Global settings in preferences, but it still cannot be used. The image won't be pasted. Just paste it.
When entering http, [INFO] Connecting to irc: // freenode/(ircs: // irc.freenode.net: 7000 /)... [Cancel]
/1.0 Connection established
=== 7.2
[ERROR] Connection to irc: /freenode/(ircs: // irc.freenode.net: 7000/) closed. [Help] Reconnecting in 8 minutes. [Cancel]
Blank by default. when nothing is entered, [INFO] Connecting to irc: // freenode/(ircs: // chat.freenode.net: 7000 /)... [Cancel]
[ERROR] Unknown host "chat.freenode.net" connecting to irc: // freenode/(ircs: // chat.freenode.net: 7000/). [Help] Reconnecting in 15 seconds. [Cancel]

When none is entered, [INFO] Connecting to irc: // freenode/(irc: // irc.freenode.net /)... [Cancel]
[ERROR] Unknown host "irc.freenode.net" connecting to irc: // freenode/(irc: // irc.freenode.net/). [Help] Reconnecting in 15 seconds. [Cancel]

What should I do for prawns?