Hi and thanks for answering
As a reboot of the client wont help, but an IAP-225 reboot does, then we can probably conclude that it is not a client driver issue but most likely an Instant firmware issue.
It is like the AP refuses the client to connect. But I cannot find any trace of existing client state caches or so in the GUI or through the terminal. But after an AP reboot everything works perfect. Then the client can connect again , reboot etc and all is good. But "just like that" (can be a week or more) the client can no longer connect, and a client reboot wont help either... After trying everything without luck, an AP reboot solves everything.
Is there a later IAP-225 firmware than the one I have? At least there is no later firmware to be found in the GUI when checking.
/Per-Olov