"Not long valid" is somewhat vague. To avoid confusion, I'd try to be as clear as possible about what's going on and what should be done to resolve the problem. At the same time, do not refer to the user ('you') directly, to have a friendlier tone-of-voice:

"A timeout has occurred. Please reload this page."

On 6 April 2016 at 12:04, Stian Thorgersen <sthorger@redhat.com> wrote:
I suggest we change the error message when a login times out or a code is not valid to:
"This page is no longer valid, please retry login from the application" and also include a link to the application if available.

I think that's more user friendly than "You took to long" and "We're sorry...".

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