Problems installing Zend framework

I have created an application in FlashBuilder 4.5 which uses PHP/MySQL as a data service which works fine on my local testing server but when uploading to my 1&1 remote server I keep getting the following error:

Send failed
Channel.Connect.Failed error NetConnection.Call.BadVersion: : url: ‘

I have set the endpoint in FlashBuilder to my URL so I don’t think that is the issue.

I have tried placing the Zend framework in the root directory and inside my website folder with no luck.

The 1&1 server is using Linux and the PHP version is 5.2.17

Any help is appreciated