I can tell you that the way I got mine setup is totally different.
I used my IP. My LDAP looks like this: ldap://192.168.8.31
Try that instead...
Also - you need to check to make sure your binding settings are right. Take a look at my binding settings and see how intense it is. It took us days to get this right. We had to use ADSIEdit and LDP.exe to figure it all out...
Under "Bind Settings" my Distinguished Name looks like this:
then the password of course is just the password.
Now, under User lookup settings, I use "User Type" MS ActiveDirectory and my Contexts look like this:
Basically, it looks for all users under the main Organizational Unit of HOC.
Finally, I set the "user attribute" to samaccountname
I hope this helps you out... it's the best I can do... it's pretty intense figuring this out if you don't know much about LDAP.
I would first start by getting your Host URL correct... you shouldn't need all that mumbo jumbo because ldap uses a standard port so you shouldn't have to specified the port UNLESS you changed it... which then I would question why.