Problem with setting up Integrated Windows Authentication (IWA) with Portal (Tested on 10.3.1

[RichardsonAluvilayil2]

I've been trying to setup IWA on a new Portal 10.4.1. I have successfully configured IWA in the past on 10.3.1 & 10.4.1 in the same network.

However, now when I try to configure the portal identity store, it fails with the following error:

Error

java.lang.Exception: Could not connect to the user store. Please check the configuration and try again.

Code: 500

Portal Log:

SEVERE	Failed to update identity store. Cannot connect to user store using supplied configuration. Verify the user store configuration is correct and try again.	2017-01-29T16:29:27,947	Portal Admin	DEV-APPSERVER.ESRI.LOCAL	Admin	205007	6776
WARNING	Unable to connect to the identity store using SSL. ArcGIS Server will revert to using a non-SSL connection to the identity store and credentials will be sent in clear text. In order to use SSL, verify that your identity store has SSL enabled.	2017-01-29T16:29:27,946	Portal Admin	DEV-APPSERVER.ESRI.LOCAL		219999	6776

I am not sure if the issue is with the Portal or anything is changed from my network side. Another post (Failed to return user store. For input string: "8997:266::8997:266" ) suggested to look for Windows Tunnel Adapter 6TO4 , but I could not find this on my Portal Server.

Any ideas?

[MarcBate]

If changing the password, make sure you change isPasswordEncrypted to false! The error Portal is giving about not accessing the store if very misleading since it is just the password that you put in as unencrypted without saying that it is unencrypted.