I'm running an intranet on a MS Server 2003 platform. After getting sick of trying to make PHP play nice with IIS 6, I was turned on to the idea of installing Apache with mod_auth_sspi. After dealing with the pooling issues, I got the AD user authentication working nicely without users being nagged for passwords! Hooray! Time to start migrating sites!

THEN, I got calls from users who couldn't submit info from forms using POST parameters. More maddeningly, the problem was intermittent.

Lots of googling later, I have identified the issue as a problem with IE using NTLM with Apache. It send a POST that's empty, making the page reload. I have seen where many others out there have the same issue. I've seen these suggestions:

Make all users authenticate. Done. No effect.
Set keepalive off. Tried it, it killed NTLM.
Turn keepalive up over 60 seconds, IE's default. Tried it, no effect.

We're a IE shop, unfortunately, otherwise I'd move everyone over to Firefox. My usesr will have to invisibly authenticate, otherwise I'm stuck with IIS (which gets flakier with every update).

Has ANYONE gotten past this IE POST form errors issue?