Redirect-Loop after Form-based(client initiated)

Hi F5-community,

 

we are currently evaluating F5 BIG IP, so I'm quite a newbie.

 

I'm trying to setup a single-sign-on Platform via APM(without LTM) for any AD-auth-applications on the internal network.

 

I managed to get Exchange-SSO working with "normal" Form based SSO. But when i try the same thing with client initiated form based SSO I get in a redirect-loop and nothing more happens.

 

this is a log where you can see the redirection-loop: https://pastebin.com/XnNevedp

 

these lines are repeating on and on.

 

The Exchange-Security-Eventlog is telling me wrong username or password.

 

Another webplatform(wordpress) with a fixed-password-login(only one field in the form) shows the same behaivor in all browsers except IE(in IE SSO is working perfectly for this form - but OWA is showing the behaivor mentioned above too)

 

I would appreciate any help you could provide!

 

thank you in advance, BR