iOS Ad-hoc Distribution over Webserver

Till now, I distribute my Apps on the device by connecting them to my Mac.

Now I want to do this over the air.

1. I export the appname.ipa from xcode


2. Create an index.html (manually)


3. Create a appname.plist file (manually)

Index.html

 <a href="http://itms-services?action=download-manifest&amp;
        url=http://ift.tt/1vX1ePG">
        click this link to install
    </a>

appname.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://ift.tt/vvUEPL">
<plist version="1.0">
<dict>
        <key>items</key>
        <array>
                <dict>
                        <key>assets</key>
                        <array>
                                <dict>
                                        <key>kind</key>
                                        <string>software-package</string>
                                        <key>url</key>
                                        <string>http://ift.tt/1DClK5C;
                                </dict>
                        </array>
                        <key>metadata</key>
                        <dict>
                                <key>bundle-identifier</key>
                                <string>XXXXXXXXXXXXX</string>
                                <key>bundle-version</key>
                                <string>1.0.0.0.281</string>
                                <key>kind</key>
                                <string>software</string>
                                <key>title</key>
                                <string>appname</string>
                        </dict>
                </dict>
        </array>
</dict>
</plist>

I host this folder on a webserver.

If I want to open the link in the index.html on my safari on iPad. --> Nothing happens.

Is there a problem on the webserver or ... ?