Thank you. I discovered that my environment variables FTP_PROXY and HTTP_PROXY where been set to some value that I used at the University. I set manually those variables to qw{} and now I don't get the errors. I also could run a small script using LWP that used to fail, and it works.

Now, I have the problem that some program is automatically setting the proxy environment variables to that value, and I have to manually reset them to reflect my actual network configurations. I have to discover which program is doing that.

Also, I have to learn some more about proxies, and how to use them with LWP.

Thank you again... I have now a lot of read and work, but at least I know where to start.