I have solved the problem: You do not need support for curl in the server where it runs the ISPConfig! I have install a PHP client with CURL support on my laptop over ubuntu. The packages that I used were as follows: php5-CLI php5-Curl I have run on my laptop php5-f test.php and ready. Obviously you need to configure properly address of the remote server, user name and password. Remember: The ISPConfig is on another server, not in my laptop!