F-Secure and No-IP

Hello,

I've installed F-Secure Internet Security 2005 Trial. Since I have dynamic ip and FTP server, I registered at

When i had Norton Internet Security everything worked just fine. New IP was properly detected and moment later was updated to No-IP DNS. When I set up F-Secure, no-ip DUC (application that detects and updates symbolic adress) is in most cases unable do detect new ip, and if detects, is unable to update it to No-IP DNS. No-IP DUC has full rights to send and receive data. What i've set wrong? My OS: Win XP SP2.

Thanks, and sorry for my english