I'm utilizing my Web-to-Lead code that I generated and plugging it into PHP code so that I can use the form on a microsite. For some reason when I'm testing the site instead of displaying the form it displays a link asking me to redirect to login to Salesforce. Does anyone know of any reason that this would happen? 

We are trying to use a PHP call to Salesforce so that we can integrate an outside home grown into SFDC. Currently I just want the person who wrote the call to be able to have access to SF. I gave him my username, password, and security token but he keeps receiving the attached error message. He is a web developer and I'm a cert. admin so I'm not super familiar with what we need to be doing. We are using the PHP connector toolkit that is provided in the community documents.
 Any help is really appreciated. 

We are trying to use a PHP call to Salesforce so that we can integrate an outside home grown into SFDC. Currently I just want the person who wrote the call to be able to have access to SF. I gave him my username, password, and security token but he keeps receiving the attached error message. He is a web developer and I'm a cert. admin so I'm not super familiar with what we need to be doing. We are using the PHP connector toolkit that is provided in the community documents.
 Any help is really appreciated.