What is the recommended best practice for upgrading PAM Terminal Servers from Windows Server 2012 to Windows Server 2019, particularly when CAL licensing is involved and the servers are used for PAM applications?
We currently operate two application servers behind a load balancer (TRM1 and TRM2). TRM1 was originally running Windows Server 2012 for our PAM application. After performing an in‑place upgrade to Windows Server 2019 using the ISO, the upgrade appeared to complete successfully. However, we encountered a significant issue: when launching any application session through PAM, users now receive full desktop access instead of the intended restricted application session.
Additionally, after a recent restart, TRM1 began displaying an RDS Licensing error, and we were only able to access the server through the console. Although we resolved the licensing issue and applied the appropriate CALs, the problem with users receiving full desktop access persists.
