Thank you it works now. But I'm a little bit confused why it's so that we need to change it to make it work. Is there a problem with Microwallet or only from my webhost?
For some reason your web hosting is unable to get the IP by name (it may be firewall or dns caching issue).
Create php file "mw-ip-test.php" and put the text below:
$ip = gethostbyname('www.microwallet.org');
echo $ip;
echo '';
$ip = gethostbyname('www.microwallet.org.');
echo $ip;
?>
It works for me:
http://bit.makejar.com/mw-ip-test.phpIf it does not output any IP address (or wrong one) for you then contact your hosting sending them a link to this file on your hosting. They should be smart enough to fix the issue

It Outputs the IP
But still Showing "Unknown error" also your Microwallet index.php fsockopen PHP function IP tip not works for me.
Thanks for helping us. I contacted hosting provider they told me to change the PHP version I checked it with all versions upto latest from 5.2 to 5.6
But not working and now Hosting provider not answering.