Dear Leslie,
Your advices were so useful for me....Thanks very much.
Exactly, the problem was outside Moodle. The problem was with my host . The problem was that they had some security restrictions to the host area where my moodle installation is located. So I told them about my problem and they very easily recognized that it was a problem at their side.
They did some internal changes in my hosting site and the problem was fixed very promptly.
I learnt something more managing Moodle with this experience.
Leslie, I want to thank very much for you support, time, comments and help.
You have a friend in Lima, where I am at your orders for anything you need.
All the very best for you,
Ricardo.