Solved cannot send snapshot to external server

Hi,

I have created a new backup server but I cannot send the snapshot to the new server:
zfs send -R zroot@-2018-05-03 | mbuffer -q -v 0 -s 128k -m 1G | ssh root@206.95.xx.xx "mbuffer -s 128k -m 1G | zfs receive -Fduv zback/zroot"
Code:
mbuffer: Command not found.
cannot receive: failed to read from stream
warning: cannot send 'zroot/usr/jails@-2018-04-16': signal received
warning: cannot send 'zroot/usr/jails@-2018-04-17': Broken pipe
warning: cannot send 'zroot/usr/jails@-2018-04-18': Broken pipe
warning: cannot send 'zroot/usr/jails@-2018-04-19': Broken pipe
warning: cannot send 'zroot/usr/jails@-2018-04-20': Broken pipe
warning: cannot send 'zroot/usr/jails@-2018-04-21': Broken pipe
warning: cannot send 'zroot/usr/jails@-2018-04-22': Broken pipe
warning: cannot send 'zroot/usr/jails@-2018-04-23': Broken pipe
warning: cannot send 'zroot/usr/jails@-2018-04-24': Broken pipe
warning: cannot send 'zroot/usr/jails@-2018-04-25': Broken pipe
warning: cannot send 'zroot/usr/jails@-2018-04-26': Broken pipe
warning: cannot send 'zroot/usr/jails@-2018-04-27': Broken pipe
warning: cannot send 'zroot/usr/jails@-2018-04-28': Broken pipe
warning: cannot send 'zroot/usr/jails@-2018-04-29': Broken pipe
warning: cannot send 'zroot/usr/jails@-2018-04-30': Broken pipe
warning: cannot send 'zroot/usr/jails@-2018-05-01': Broken pipe
warning: cannot send 'zroot/usr/jails@-2018-05-02': Broken pipe
warning: cannot send 'zroot/usr/jails@-2018-05-03': Broken pipe
Could anyone please tell me where do I start in order to debug the problem?
What log file do I need to analyze?
PRODUCTION SERVER:
zfs list
Code:
NAME                                               USED  AVAIL  REFER  MOUNTPOINT
zroot                                              152G   364G   192K  /zroot
zroot/ROOT                                        3.81G   364G   192K  none
zroot/ROOT/default                                3.81G   364G  3.54G  /
zroot/tmp                                         19.4M   364G  16.1M  /tmp
zroot/usr                                          147G   364G   192K  /usr
zroot/usr/home                                     377M   364G   374M  /usr/home
zroot/usr/jails                                    141G   364G  5.56G  /usr/jails
zroot/usr/jails/bcbsd-ubnt-dsk1.vhd               10.3G   375G   112K  -
zroot/usr/jails/bollenberg                        2.70G   364G  3.13G  /usr/jails/jails-data/bollenberg-data
zroot/usr/jails/childrenandanimals                 724M   364G  1.28G  /usr/jails/jails-data/childrenandanimals-data
zroot/usr/jails/colocation                        6.40G   364G  6.78G  /usr/jails/jails-data/colocation-data
zroot/usr/jails/devopslab                         3.36G   364G  3.65G  /usr/jails/jails-data/devopslab-data
zroot/usr/jails/duramat                           3.78G   364G  4.12G  /usr/jails/jails-data/duramat-data
zroot/usr/jails/equifloor                          176K   364G   689M  /usr/jails/jails-data/equifloor-data
zroot/usr/jails/leedscircus                       1.04G   364G  1.48G  /usr/jails/jails-data/leedscircus-data
zroot/usr/jails/mariadb                           25.7G   364G   430M  /usr/jails/jails-data/mariadb-data
zroot/usr/jails/mariadb/var                       25.1G   364G  59.8M  /usr/jails/jails-data/mariadb-data/var
zroot/usr/jails/mariadb/var/db                    25.1G   364G   351M  /usr/jails/jails-data/mariadb-data/var/db
zroot/usr/jails/mariadb/var/db/mysql              21.9G   364G  9.73G  /usr/jails/jails-data/mariadb-data/var/db/mysql
zroot/usr/jails/mariadb/var/db/mysql-innodb        260M   364G  77.2M  /usr/jails/jails-data/mariadb-data/var/db/mysql-innodb
zroot/usr/jails/mariadb/var/db/mysql-innodb-logs  1.79G   364G  96.3M  /usr/jails/jails-data/mariadb-data/var/db/mysql-innodb-logs
zroot/usr/jails/mmamats                           2.76G   364G  1.59G  /usr/jails/jails-data/mmamats-data
zroot/usr/jails/nginx                             4.08G   364G  3.14G  /usr/jails/jails-data/nginx-data
zroot/usr/jails/ns1                                109M   364G  89.1M  /usr/jails/jails-data/ns1-data
zroot/usr/jails/rddprojects                        157M   364G   749M  /usr/jails/jails-data/rddprojects-data
zroot/usr/jails/softfloor                         4.52G   364G  4.92G  /usr/jails/jails-data/softfloor-data
zroot/usr/jails/softfloorkids                     26.6G   364G  7.76G  /usr/jails/jails-data/softfloorkids-data
zroot/usr/jails/sophimail                         36.1G   364G  23.7G  /usr/jails/jails-data/sophimail-data
zroot/usr/jails/trendytikes                        176K   364G   689M  /usr/jails/jails-data/trendytikes-data
zroot/usr/jails/trinitech                         5.27G   364G  4.45G  /usr/jails/jails-data/trinitech-data
zroot/usr/jails/wordpress_tpl                     2.09G   364G   699M  /usr/jails/jails-data/wordpress_tpl-data
zroot/usr/ports                                   4.85G   364G  1.75G  /usr/ports
zroot/usr/src                                      999M   364G   999M  /usr/src
zroot/var                                         45.6M   364G   192K  /var
zroot/var/audit                                    192K   364G   192K  /var/audit
zroot/var/crash                                    192K   364G   192K  /var/crash
zroot/var/log                                     41.3M   364G  2.86M  /var/log
zroot/var/mail                                    3.01M   364G   583K  /var/mail
zroot/var/tmp                                      735K   364G   208K  /var/tmp
BACKUP SERVER:
zfs list
Code:
NAME                 USED  AVAIL  REFER  MOUNTPOINT
zback                437M   480G   116K  /zback
zback/ROOT           435M   480G    88K  none
zback/ROOT/default   435M   480G   435M  /
zback/tmp            116K   480G   116K  /tmp
zback/usr            456K   480G    88K  /usr
zback/usr/home       192K   480G   192K  /usr/home
zback/usr/ports       88K   480G    88K  /usr/ports
zback/usr/src         88K   480G    88K  /usr/src
zback/var            724K   480G    88K  /var
zback/var/audit       88K   480G    88K  /var/audit
zback/var/crash       88K   480G    88K  /var/crash
zback/var/log        248K   480G   248K  /var/log
zback/var/mail        88K   480G    88K  /var/mail
zback/var/tmp        124K   480G   124K  /var/tmp
zback/zroot          132K   480G   132K  /zback/zroot
 
mbuffer: Command not found.

I don't use ZFS and may say something stupid but.. is mbuffer installed on both servers?

And you must enable ssh as root user (which is disabled by default on FreeBSD) to run that command.
 
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