error-pam-authentication-error-for-root-when-trying-to-ssh-to-freebsd-server-as-root

By default ssh is disabled in Freebsd and work around is shared my one of my posts, http://www.zyraxtech.com/2014/06/permission-denied-keyboard-interactive-authentication/ :

However We faced an issue with one of our old server who’s ssh was configured, by one of the lines were changed mistakenly which caused following error:

error: PAM: authentication error for root from 192.168.XXX.XXX

following lines were checked and changed:

PermitRootLogin yes 
PasswordAuthentication yes 
AllowUsers vht

to

AllowUsers root

NOTE: allowuser line was mistakenly changed.

Hope this helps !

unknown modifier ‘t’ freebsd ports error

Recently faced an error to install port in freebsd 9.0, the reason for this type of error is due to freebsd support for older version is no longer there. below is the screen shot of the error:

“unknown modifier ‘t’ freebsd ports”

to overcome this I updated freebsd 9.0 to 9.1 and then installed the ports easily.

root@freebsd:/root#freebsd-update upgrade -r 9.1-RELEASE

(to update release from 9.0 to 9.1)

/usr/sbin/freebsd-update install

(to install the update)

then reboot the server and run the above command again

root@freebsd:/root#portsnap fetch update

(to update the ports)

then you can install the desired ports without any error!

HOPE it works for you as well !

Permission Denied keyboard-interactive authentication

By default Freebsd has root ssh disabled. Even in Ubuntu 14.04 it is not allowed with some other linux/unix distros as well.

Following error we get on screen even after entering correct password:

To overcome this issue edit following ssh file: (ee is editor in freebsd)

ee /etc/ssh/sshd_config

in the file remove # from port 22

and remove # from

PermitRootLogin no

to

PermitRootLogin yes

then restart sshd demon

/etc/rc.d/sshd restart 

Remote host identification has changed

Normally this issue has a simple solution but people tend not to read whats is required to eliminate the error:

When you run the ssh command following error is received:

to remove this error, you just need to edit single line on the following path (I am using nano as editor):

 nano /root/.ssh/known_hosts

Remove the line which corresponds to the IP address which you were trying to access via ssh. save the file and again try to ssh.