Hello Горбешко Богдан, I am not involved in packaging samba but tried to get some more details.
Currently smblcient fails with that message: $ smbclient --user=testuser --ip-address=127.0.0.1 //testhost/C testtest Unable to initialize messaging context protocol negotiation failed: NT_STATUS_IO_TIMEOUT This seems to be due to smbclient sending out a SMB2 tcp message, which is not responded to by Windows XP. Therefore you could specify max-protocol at the command line which fails that way (seems to come from the windows side): $ smbclient --user=testuser --ip-address=127.0.0.1 --max-protocol=NT1 //testhost/C testtest Unable to initialize messaging context protocol negotiation failed: NT_STATUS_INVALID_PARAMETER_MIX This behaviour started at upstream following commit and is contained in samba-4.11.0rc1 and later. https://git.samba.org/?p=samba.git;a=commitdiff;h=3264b1f317d6c603cc72eb2a150fe244c47aa3ac Therefore smbclient could be convinced to connect by: $ smbclient --user=testuser --ip-address=127.0.0.1 --option='client min protocol = CORE' //testhost/C testtest Or setting 'client min protocol = CORE' globally in /etc/samba/smb.conf. Bug https://bugs.debian.org/941930 seems to be about the same issue. Kind regards, Bernhard