Recently my staff started to report the error while they were logging into the osTicket "Valid CSRF Token Required"I can login in as a staff, but when I click onto "Admin Panel" there is another login window and after that I am getting the same error message.Therefore I am not able to login as an admin.The first reports from the staff happened with version 1.9.8.1 but personally I have experienced it after na upgrade to 1.9.9.1I cannot provide anymore details about evironment (especially logs) as there are no error logs on this hosted server.Any ideas?EDIT---------------It seems the presence of ldap-auth.phar file in the plugins folder was the root cause of the issue. Since I have removed this file from plugins folder everything seems to back to normal.We use local authentication so far and were preparing to introduce AD authentication, hence this file present in plugins folder.All seems to be ok now.