iControl - PHP - Errors, only on Linux.

I'm assuming you aren't actually passing through "" as the error indicates and that "" is actually the address of your bigip management interface. If you are passing through a correct hostname and user/pass, then it's most likely due to BIG-IP's self-signed certs. Other tool kits allow you to bypass hostname verification. I found this link that may be helpful to you:

http://stackoverflow.com/questions/8443618/disable-certificate-verification-in-php-soapclient

It shows doing something like this:

$context = stream_context_create(array(
    'ssl' => array(
        'verify_peer' => false,
        'verify_peer_name' => false,
        'allow_self_signed' => true
    )
));

$client  = new SoapClient(null, array( 
    'location' => 'https://...',
    'uri' => '...', 
    'stream_context' => $context
));

Hope this helps...

-Joe