login with basic auth gives 403 FORBIDDEN

When visiting the url, I get a basic-auth prompt, fill in the exact same username and password as typed in the code. And I successfully login. When trying the same with unity I get the following error:

You are trying to load data from a www stream which had the following error when downloading. 403 FORBIDDEN

I know I'm on the right track because before I would get 401 authorization required. The server is an ubuntu 12.04 with apache2.

 void LoginUser(string enteredUsername, string enteredPassword){
         encryptedPassword = md5(enteredPassword);
 
         WWWForm form = new WWWForm();
         form.AddField("our_username", enteredUsername);
         form.AddField("our_password", encryptedPassword);
         rawData = form.data;
 
         Hashtable header = new Hashtable();
         header = form.headers;
 
         header.Add("Authorization", "Basic " + System.Convert.ToBase64String(System.Text.Encoding.ASCII.GetBytes("username:password")));
         www = new WWW(url, rawData, header);
 
         StartCoroutine(WaitForRequest(www));
         
         // Application.LoadLevel("Game");
         
     }
     
     
     IEnumerator WaitForRequest(WWW www){
         
         yield return www;
         Debug.Log(www.text);
         
         // check for errors
         if (www.error == null){
             Debug.Log("WWW Ok!: " + www.text);
         } else {
             Debug.Log("WWW Error: "+ www.error);
         }    
     }