[TYPO3-english] Backend login don't work

[TSniper]

Hello,

I'm trying to login to the backend but didn't work, always show me the login form, i repeat my login and it always the same.
I can access to installtool and create a new login access, but it is always the same.
this problem i after i finish upgrade from 4.5 to 6.2.25.

i check the log and there is no error.
the only notice is from browser console : 'webkitIndexedDB' is deprecated. Please use 'indexedDB' instead.

What  i can do to resolve this ?

Thanks