Bueno, según el RFC del tal EPP, éste debe correr bajo TCP/SSL, pero aun así lo probé, y lo que obtengo (cosa curiosa) es:
ERROR: 152927512 - Unable to find the socket transport "https" - did you forget to enable it when you configured PHP?
Y digo cosa curiosa por que tengo habilitado el ssl (openssl) y los sockets:
'./configure' '--with-apxs' '--with-curl' '--with-curl-dir=/usr/local/lib' '--with-gd' '--with-gd-dir=/usr/local' '--with-gettext' '--with-jpeg-dir=/usr/local/lib' '--with-kerberos' '--with-mcrypt' '--with-mhash' '--with-mysql=/usr' '--with-pear' '--with-png-dir=/usr/local/lib' '--with-xml' '--with-zlib' '--with-zlib-dir=/usr/local/lib' '--with-zip' '--with-openssl' '--enable-bcmath' '--enable-calendar' '--enable-ftp' '--enable-magic-quotes' '--enable-sockets' '--enable-track-vars' '--enable-mbstring' '--enable-memory-limit'
Además de estar habilitado el allow_url_fopen
allow_call_time_pass_reference Off Off
allow_url_fopen On On
allow_url_include Off Off
always_populate_raw_post_data Off Off
¿Alguna otra idea de lo que pudiera ser?