CRM API URL not working

CRM API URL not working

Hi Team,

Following code does not execute at all
  1. $ch = curl_init('https://crm.zoho.com/crm/private/json/Leads/getRecords?authtoken=TOKEN&scope=crmapi');
  2. $jresponse = curl_exec($ch); 
and echoing $jresponse returns "false"

When I try using same URL on browser, it works.  It happened suddenly on our running live server couple of days ago and It seems cURL not even try to hit the URL. I tried cURL for URLs other than ZOHO CRM they all working fine.

As a matter of fact every JSON or XML CRM API requests at https://crm.zoho.com/crm/private/json/* is not working at all in our system.

Any help will be highly appreciable as I'm trying to resolve this for the past two days but no luck.

Thanks,
Hasan