Some SSH servers can disable SSH logins for certain users and may even disable root logins by default. If none of the above works, clear the field Connection → Data → Auto-login username (assuming it is set) and enter the password in the username field to verify it gets entered correctly. If you use AltGr, make sure Terminal → Keyboard → AltGr acts as Comopse key isn't checked. Instead of Ctrl+V, try copying the password, then click inside the console and right click. Verify that PuTTY uses the proper keyboard layout. If you're not entering the username manually, make sure Connection → Data → Auto-login username is actually set to root. It only means that you have an account with root privileges (normally via sudo). The fact that you have root access doesn't mean you can actually log in as root.
If you're using a host name, verify that it's pointing to the right IP address and/or try the IP address instead. You're not connecting to the right server. There are only four potential problem I can think of (most of which have been covered already):
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