I forgot to mention I use Moodle 1.9.12 with OK Tech Webservices ( aka wspp). I checked the config settings and Web Service access is not disabled.
I didn't find any place where to check that SOAP capability.
In the OK Tech Webservices config section I found that If I enable/disable the last option:
<SOAP-ENV:Body>
<SOAP-ENV:Fault>
<faultcode>WSDL</faultcode>
<faultstring>SOAP-ERROR: Parsing WSDL: Couldn't load from 'http://moodle.agorasanitaria.com/wspp/wsdl_pp2.php'</faultstring>
</SOAP-ENV:Fault>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>
it changes to (when I activate the auto_generated wsdl:
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
<SOAP-ENV:Body>
<SOAP-ENV:Fault>
<faultcode>WSDL</faultcode>
<faultstring>SOAP-ERROR: Parsing WSDL: Couldn't load from '/srv/htdocs/moodledata/wspp/moodlews2.wsdl'</faultstring>
</SOAP-ENV:Fault>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>
Then what I did is to copy manually the wsdl generated to the moodledata directoy and it worked!! Just in case anyone had the same problem...