Hello there,
I am wondering, did you update the OS as well.
I think we would need to know more...
For now, I can only say that the SAS metadata logs and your OS logs will tell you more of what is going on.
My first thought, assuming you are working with a UNIX/Linux-based OS, is that your pam and sasauth files are overwritten.
https://support.sas.com/documentation/installcenter/en/ikfdtnunxcg/66380/PDF/default/config.pdf
When you have upgrades, there are some customizations - and this is one of them - that you need to check and bring back.