With fiddler you can see the problem. One hacky solution is to catch this request and response with a fake answer. After this the IE will send the normal POST data.
To get the correct NTLM response use fiddle during a NTLM login. Switch the inspector to "Auth" and look for the "Type: 1" response and replace
Note: This might be a security risk. Make sure to check the user Session and send him to your NTLM login is needed.
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