Hi @JonathanQuinn
We are getting the same issue with a non-ha 10.9.1 environment on AZURE that we just built with powershell dsc (no errors returned with the install, all prefect, love DSC!!).
3-machines: m1 Portal & portal/server wa's; m2 Server and m3 datastore.
Instead of a LB we are using a DNS entry for prettyname.com and both the webcontexturl and privateportalurl use this (automatically setup by dsc as we set the externalloadbalancer tag to prettname.com for both portal and server blocks.
When we turn on IWA via IIS the settings the same as above happens, cannot get to settings and when we try to connect to AGS manager we are prompted for siteadmin uname/pw.
We have a dev setup in the same way but was done manually and the privalportalurl is not set. Switching on IWA works perfectly. I also noticed that federation uses 7443 on this setup whereas the DSC has the prettyname.com.
Any ideas on what we can check/do?
Thanks
Lachlan W