[xwiki-users] Login cookie validation hash mismatch! Cookies have been tampered with

We set up a new Box with a fresh install of a 7.4.1 version. While configuring and testing (permissions) everything all was perfect and clean. Then we migrated the pages from the old wiki (also 7.4.1 - we wanted a fresh install) - precisely only content pages, nothing else. Then we switched the IP for the old domain and all of our LDAP user populated the new wiki, one by one. Since the fresh start all users experience the trouble that after the end of the tomcat session (30 minutes) a re-login is required. After re-login a XWiki message appears "you do not have the appropriate rights" (or similar). Deletion of the cookie ~or closing the browser window and login again reestablishes normal functions until the tomcat session is over again. catalina.out: 2016-03-03 11:55:26,813 [https://wiki.sub.domain/xwiki/bin/view/Main/] WARN u.i.x.MyPersistentLoginManager - Login cookie validation hash mismatch! Cookies have been tampered with Research in this forum did bring up discussions about the mess from 2010 and bevor without any valuable pointers. We updated to 7.4.2 without any change for the situation. The site ist secure with a nginx proxy. Any ideas? -- View this message in context: http://xwiki.475771.n2.nabble.com/Login-cookie-validation-hash-mismatch-Coo… Sent from the XWiki- Users mailing list archive at Nabble.com.