The browser you are using is different than the one that initiated the session.

[DavidF]

@kudzu:
"Which log are you referring to?"
- We use the TIWExceptionLogger

@Alexandre Machado:
"How are you receiving data?"
- We have an app that uses a TRESTRequest to retrieve data from an api via a content handler. The first request (when the app logs in) works, but the second (when the app retieves data) fails with the aforementioned message. I will take your advice an check if the user agent of the TRESTRequest somehow changes.