What is causing an Internal Error 500 when Impersonating a User after SanDiego upgrade on my PDI

[Ken K]

Internal Error 500 when Impersonate User after SanDiego upgrade on my PDI

When impersonating a User, I receive an Internal Error 500 after upgrading to SanDiego.  

I did run into this issue after the upgrade as well around Unknown User, but this guidance resolved the issue. I am unsure if they are related.

https://community.servicenow.com/community?id=community_article&sys_id=6a0728c1db84d59439445ac2ca9619fc

[anubhavkapoor76]

@Ken K - What does the logs say?

[Ken K]

Most of the errors state the inability to handle a null request and this:

2022-06-11 08:06:27

Error

null: no thrown error

com.glide.ui.ServletErrorListener

[Ken K]

And now my instance is suddenly offline while in the middle of using it.