Permission denied via ssh over ipv6

[PstreeM China]

Hello Everyone:

Very thanks, this problem has searched from google, but not find the
solution to fix this issue.

new install FreeBSD in virtual machine.
Freebsd version is 12.2
Duel stack support ipv4 and ipv6; enable sshd as default.
I can ping the ipv4 and ipv6 address.

The problem is:
SSH over ipv4 is work well.
But ssh over ipv6, Can be connected, but after input the password, it is
failed , give the notify : permission denied.
can not log into the server.
I am sure the password is right.

No firewall enable in this server.

How should I do to fix this ? Thanks very much .

//Armin