Sshuttle Failed to Establish SSH Session

I connect to this server regularly via ssh. I own it. But I cannot connect via sshuttle. Please see below for details:

zzetyi@x1-c:~$ sshuttle -v -r zzetyi@info.co 0/0
Starting sshuttle proxy (version 1.3.2).
c : Starting firewall manager with command: ['/usr/bin/sudo', '-p', '[local sudo] Password: ', '/usr/bin/env', 'PYTHONPATH=/usr/lib/python3/dist-packages', '/usr/bin/sshuttle', '-v', '--method', 'auto', '--firewall']
[sudo: [local sudo] Password: ] Password:         
fw: Starting firewall with Python version 3.14.4
fw: ready method name nat.
c : Using default IPv4 listen address 127.0.0.1
c : IPv6 enabled: Using default IPv6 listen address ::1
c : Method: nat
c : IPv4: on
c : IPv6: on
c : UDP : off (not available with nat method)
c : DNS : off (available)
c : User: off (available)
c : Subnets to forward through remote host (type, IP, cidr mask width, startPort, endPort):
c :   (<AddressFamily.AF_INET: 2>, '0.0.0.0', 0, 0, 0)
c : Subnets to exclude from forwarding:
c :   (<AddressFamily.AF_INET: 2>, '127.0.0.1', 32, 0, 0)
c :   (<AddressFamily.AF_INET6: 10>, '::1', 128, 0, 0)
c : TCP redirector listening on ('::1', 12300, 0, 0).
c : TCP redirector listening on ('127.0.0.1', 12300).
c : Starting client with Python version 3.14.4
c : Connecting to server...
zzetyi@info.co: Permission denied (publickey,gssapi-keyex,gssapi-with-mic).
c : fatal: failed to establish ssh session (2)

Connecting to server failed with:

zzetyi@info.co: Permission denied (publickey,gssapi-keyex,gssapi-with-mic).
c : fatal: failed to establish ssh session (2)

Greatly appreciate your help to resolve.