Last couple of day's I find problems with the forticlient in IPSEC mode.
Installations that have been working for months without a problem suddenly can't loggon to the firewal.
I uninnstall and reinstall, register new but it's just not connecting telling me if to check my shared-key and password.
It seems related to the PC the client runs on since it's authorizing the user.
I tested this with users that work on other client's.
I've switched these user over to SSL there it works.