We're testing a migration from Sharepoint 2010 to 2016 (installed on WIndows Server 2012R2) and we managed to make it work and import all files from old one. We have 2 main problems:
Somehow our farmadmin account it's not recognized as admin account in Central Administration and for that it cannot be used to log in (we can only login with a personal account or with any other account but use http://localhost:xxx which only brings part of functionality) - we tried every solution that could find on internet but with no luck.
Our User Profile Service not updating user info -> Ex: I have a user in an Active Directory group Alpha and I move it to group Beta -> I try Incremental Synchronization (no update) -> I try Full Sync (again no update) he still can see files from old group and not the new one - only way to see changes is to do an iisreset (or wait for a few hours when something happens and it updates) -> Is this a normal behavior? Because in SP2010 changes could be seen in a matter of minutes or less.
UPDATE - I managed to make sync(second issue) work by doing THIS
$sts = Get-SPSecurityTokenServiceConfig $sts.FormsTokenLifetime = (New-TimeSpan -minutes 2) $sts.WindowsTokenLifetime = (New-TimeSpan -minutes 2) $sts.LogonTokenCacheExpirationWindow = (New-TimeSpan -minutes 1) $sts.Update() iisreset /noforce