OK, I'll give this a try:
It appears you are not able to connect to Dalnet since you upgraded from 4.x to 5.x. I don't know if there are specific changes in the security between the versions, but I believe you need to implement port forwarding. The best way to do that is to go here:
http://www.myezserver.com/downloads/mitel/contrib/portforwarding-0.0.1/Read the README, install the rpm, and then go to the web browser console for SME and find the new link labeled "Port Forwarding" (the last item under the Configuration heading) and fill in the boxes like this:
Protocol: TCP
External Port number: 113
Destination IP address: [.....]<--- IP of the ONE workstation running IRC
Destination Port number: 113
BTW, your English translation was difficult, so gave your French text to some French-speaking friends --- they say your French is not very clear either. It would be best is you did not use any abbreviations next time
