Hi, still waiting for any response.
I tried hard and find out that problem with "Failed to connect to sandbox.jiveon.com port 443". Is any body know about this error regarding jiveon api call ?
Since I'm not familiar with the nuances of PHP Curl, I would recommend trying regular bash CURL in terminal/command prompt and follow these instructions:
When/If it works and you get a token, I would make the same request to http://requestb.in instead of sandbox.jiveon.com in bash CURL and PHP CURL and see what the difference is in the two requests. Compare your full PHP CURL request and bash/command prompt CURL request. If the bash/command prompt CURL request doesn't get you a token and you've followed the instructions in the link I pasted, then I would look at other factors (firewall?).