Look.. we'r almost 100% shure that it's a Router/firewall-issue here.
You say yourself that you are connected to a LAN, and the odds for the new computer reciving the SAME IP is slim.. and also VERRY likely, is that your Client is NOT configured correctly, eg. You have not defined the same connection-port as the old client had, and will get issues with the firewall.
Have you tried running it in PASSIVE-mode? Will it connect at all in passive?
When we say IP has changed, we'r not talking about you PUBLIC IP, the one you have on the net, but rather your LOCAL, that usualy looks like this: 192.168.XXX.XXX or simulare (not the 127.0.0.0/localhost)
Take a look again, and get back to us.
It's hardly ever the software-firewalls that give you trouble, but the real one.
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Meh....
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