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                         To setup Zend Debugger tunneling for a remote server: 
                        
                            - In the menu-bar, select Window 
 | Show View | PHP Servers.
 The PHP Servers view is displayed. 
                         
                        
                             
                            
                         
                        
                            - Double-click the remote server you wish to configure a Zend Debugger tunnel for, or click the Edit icon 
 . The Edit Server dialog is displayed.  
                            - Select the Tunneling tab.
 
                         
                        
                             
                         
                        
                            - Select the Enable Zend Debugger Tunneling check-box, and configure the following settings:
- Specify return host - In some system configurations, a dedicated tunneling server is used which allows debug connectivity between Zend Studio and the server which is being debugged. In this case, select the  check-box, and enter the IP address of the tunneling server to which the tunneling connection will be opened.
 - Authentication - If your Web server requires HTTP authentication, enter your User Name and Password in the Authentication category. Zend Studio sends the authentication information in the header.
 
  
                            - 
                                
If your Web server requires HTTP authentication, enter your username and password in the designated fields. Zend Studio sends the authentication information in the header. 
                             
                            - Click Finish.
 
                            - In the toolbar, click arrow 
			 next to the Tunneling icon on the toolbar 
  
			 and select the server which you configured for tunneling. 
                         
                        
                             
                            
                         
                        The tunneling 
			 icon will turn green to show that a tunneling server 
			 is connected:  . 
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