Error receiving HTTP headers - SOAP error

Question

I try to call a third-party SOAP server from a PHP soap client, but most often I get this as an answer: {"faultstring": "Error receiving HTTP headers", "error code": "HTTP"}

I already tried:

• Setting default_socket_timeout in my php.ini both manually and in code using ini_set .

• Next parameter SoapClient

  $ client = new SoapClient ($ wsdl, array ('trace' => true, 'connection_timeout' => 500000, 'cache_wsdl' => WSDL_CACHE_BOTH, 'keep_alive' => true));

Any help in this regard would be great, and I would be more than happy to share more snippets of code.