Google imap error

I have created an application in PHP. I have also create a script in this application which reads inbox messages from my Gmail account. It is successfully executing at localhost but giving error on remote. I have tried almost every possible alternate as I understand but not succeed. It gives me following error at remote

imap_open() [function.imap-open]: Couldn't open stream {imap.gmail.com:993/imap/ssl}INBOX

I have used alternate imap's address from different forum discussion but not it not working.

My remote information as following:
[TABLE="class: truncate-table, width: 100%"]
[TR="class: row-even"]
[TD="class: stats_left, align: left"]Apache version[/TD]
[TD="class: stats_right, align: left"]2.2.15[/TD]
[/TR]
[/TABLE]
[TABLE="class: truncate-table, width: 100%"]
[TR="class: row-odd, bgcolor: #F3F3F3"]
[TD="class: stats_left, align: left"]PHP version[/TD]
[TD="class: stats_right, align: left"]5.2.9[/TD]
[/TR]
[/TABLE]
[TABLE="class: truncate-table, width: 100%"]
[TR="class: row-even"]
[TD="class: stats_left, align: left"]MySQL version[/TD]
[TD="class: stats_right, align: left"]5.0.95-community-log[/TD]
[/TR]
[/TABLE]
[TABLE="class: truncate-table, width: 100%"]
[TR="class: row-even"]
[TD="class: stats_left, align: left"]Operating system[/TD]
[TD="class: stats_right, align: left"]linux[/TD]
[/TR]
[/TABLE]

and having dedicated IP.

On the other hand, Localhost information as following:

Appache 2.2.17
PHP 5.3.5
MYSQL 5.5.8

Is this because of this difference??? or any other reason?