Leveraging BIG-IP APM for seamless client NTLM Authentication
Many customers express interest to use F5 Access Policy Manager for transparent seamless authentication for their users. There are a couple of leading use cases that drive that desired behavior:
...
I'm getting the same error that a session is already in progress. It appears that it is only doing the RULE_INIT piece every time even when calling from the External logon page with /ntlm. It does this several times and then errors out.