To find the version of Bind, try this suggestion from Mr. DNS
If possible, post your resolv.conf file from that server. Should be in /etc (not sure since it's AIX).
From what you have posted, DNS is not working. It should have been able to find www.yahoo.fr. Is this server connected to the Internet? If not, check where it sends it queries to (forward statement in the configuration files). Insure that it can ping the forwarder. If it's not set up, you might start there.
Also, can you do nslookups on servers in your domain?