PHP SoapCLient, Soap call giving an error in Drupal

I am getting the following error, when I try making a SOAP call.

Warning: SoapClient::__doRequest() [soapclient开发者_Python百科.--dorequest]: php_network_getaddresses: getaddrinfo failed: Name or service not known in

and the error

HTTP-Could not connect to host

Things that I have ensured :

• allow_url_fopen : is enabled.
• The WSDL is being accessed. The server is not down.
• I have set the SOAP time out to 15 seconds.

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The IP of the host you are connecting to cannot be resolved. See my answer in

simplexml_load_file not working "php_network_getaddresses: failed: Name or service not known"

for what to do.