Your login has expired. Please sign in again

Hello. I have configured SSO between servers, but when I go from server A to server B appears this: “Your login has expired. Please sign in again”. Cookie session time is 30 minutesCan anybody help me?

Thanks

Subject: SOLVED!!!

This saturday change the time in Spain. The second server has 1 hour more than the first server. The session cookie time was 30 minutes. This was the problem

Thanks