Hi, had a real problem, i can't change the nameserver, look on this board and FreeBSD board for an issue, but found nothing.

How i can change the nameserver with my Pihole DNS??

Works fine on Mac OS X, Windows...

Finally i found the issue, after checking the Pihole i see that the lan cable was pinched.

After change it everything's back to normal.

Thanks for helping, next time i look first physically connections xD