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To log in via ssh, the user must be in the "administrators" group.If you look at /etc/ssh/sshd_config on the Synology you will see an AllowGroups line that sets up this restriction. If you put user2 into the administrators group, they will be able to log in with ssh.Putting a user into the administrators group will automatically change their shell (the last field on their line in /etc/passwd dvr:nas:synology [HDHomeRun] Jun 24, 2020 Synology SSH setup for NAS connection » domalab
Mar 06, 2019
Configure Synology NAS SSH Key-based authentication May 06, 2018
Synology DiskStation に SSH ログインする. 注意：SSH/Telnet は、[administrators] グループに属するユーザーでしかシステムにログインできない 注意：root 昇格の方法が DiskStation Manager (DSM) 6．0 以降は admin ユーザーでログイン後、sudo -i コマンドの実行に変更されている
SSH change port - possible ? - Synology Forum Nov 23, 2007 Backup to your Synology NAS with rsync - GnaX.io Oct 31, 2019 Synology installation folder - Domoticz Apr 10, 2018 use SSHFS to mount Synology NAS - Unix & Linux Stack Exchange