Remote Terminal

uniTerm supports three remote terminal protocols: SSH, Telnet, and Mosh.

SSH

SSH (Secure Shell) is the most commonly used protocol for remote server management, providing encrypted secure connections.

Connection Parameters

Parameter	Description
Host	Server IP or domain name
Port	Default 22
Username	Login username
Authentication	Password or key
Password	Required for password authentication
Key Path	Select private key file for key authentication
Character Encoding	Terminal charset, default UTF-8. Also supports GBK, GB2312, Big5, Shift-JIS, etc.
Backspace Key	Byte sequence sent for backspace, default BS (0x08). Also supports DEL (0x7F) and VT220 Delete (ESC[3~)
SSH Tunnel	Select an existing SSH connection as a jump host to forward traffic to the target host
Startup Script	Commands automatically executed after the connection is established, one per line, executed sequentially
SFTP Max Concurrent Transfers	Maximum number of simultaneous SFTP file transfers, 0 for unlimited
X11 Forwarding	When enabled, remote X11 applications can display on the local X Server (macOS requires XQuartz; Windows has VcXsrv built-in)
Start Recording Log on Connect	Automatically start recording the session log when the connection is established

Authentication Methods

• Password Authentication -- Enter password to log in. If the password is not saved, a terminal prompt will appear for input upon connection.
• Key Authentication -- Select an SSH private key file (e.g. ~/.ssh/id_rsa) for passwordless login.
• Keyboard-Interactive Authentication -- Always available as a fallback; automatically enables interactive authentication when password or key authentication fails.

SSH Tunnel

Traffic from other connections can be forwarded through an SSH tunnel via a jump host, enabling intranet penetration. After selecting an existing SSH connection as the jump host, traffic to the target host will be encrypted and forwarded through that SSH connection. Different usernames and passwords can be specified for the tunnel.

Post-Login Expect

The Expect/Send pattern supports interactive login automation by defining matching rules and send content in sequence:

• expect -- Wait for terminal output matching this text (supports regex, case-insensitive)
• send -- Text to send after a successful match. Supports ${password}, ${user}, and ${host} variables
• enter -- Whether to append a carriage return after sending (default: yes)
• timeout -- Per-step timeout (default 10 seconds, max 120 seconds)

Zmodem File Transfer

In an SSH terminal, you can directly use the rz (receive files) and sz (send files) commands to transfer files without opening the file browser. Drag-and-drop from the desktop to the terminal window for direct upload is also supported.

X11 Forwarding

With SSH X11 forwarding, graphical application windows from a remote Linux server can be displayed directly on the local desktop.

Windows version includes VcXsrv X Server built-in, ready to use out of the box. macOS users need to install XQuartz (brew install --cask xquartz).

SSH Terminal Tab Operations

Tabs support drag-to-reorder and drag-to-split into panels. Right-click a tab to open a context menu:

Menu Item	Description
Duplicate Session	Duplicate the current SSH connection and open a new tab
Open SFTP	Open the SFTP file browser on the current connection
Upload File	Send the rz -be command to the terminal to receive files remotely
Open Server Monitor	Open the server monitoring panel on the current connection
Text Search	Search for keywords in terminal output
Export Text	Export current terminal output as a text file

Telnet

Telnet is a simple plain-text remote terminal protocol, commonly used for connecting to embedded devices, network equipment, and legacy systems.

Connection Parameters

Parameter	Description
Host	Device IP or domain name
Port	Default 23
Username	Login username (optional, automatically sent after connection)
Password	Login password (optional, automatically sent after username)
Character Encoding	Terminal charset, default UTF-8. Also supports GBK, GB2312, Big5, Shift-JIS, etc.
Backspace Key	Byte sequence sent for backspace, default BS (0x08). Also supports DEL (0x7F) and VT220 Delete (ESC[3~)
Negotiation Mode	Active (default) or passive; affects which side initiates Telnet option negotiation
Send Mode	Character-at-a-time (default) or line-at-a-time
Local Echo	When enabled, input characters are echoed locally; when disabled, echo is handled by the server
Newline Mode	CR (default) or CR+LF
SSH Tunnel	Select an existing SSH connection as a jump host to forward traffic to the target host
Startup Script	Commands automatically executed after the connection is established
Start Recording Log on Connect	Automatically start recording the session log when the connection is established

Warning: Telnet transmits data without encryption. Use only on trusted networks.

Mosh

Mosh (Mobile Shell) is designed for high-latency and intermittent networks. Based on UDP transport, the connection does not drop when switching networks (e.g. Wi-Fi to 4G).

Connection Parameters

Same as SSH. uniTerm first connects to the server via SSH, then automatically starts mosh-server to establish a UDP session.

Parameter	Description
Host	Server IP or domain name
Port	SSH port, default 22
Username	Login username
Authentication	Password or key
Character Encoding	Terminal charset, default UTF-8. Also supports GBK, GB2312, Big5, Shift-JIS, etc.
Backspace Key	Byte sequence sent for backspace, default BS (0x08). Also supports DEL (0x7F) and VT220 Delete (ESC[3~)
Startup Script	Commands automatically executed after the connection is established
Start Recording Log on Connect	Automatically start recording the session log when the connection is established

Note: The server must have mosh-server installed before using Mosh. Mosh does not support SSH tunnels or the Expect/Send pattern.

Related

• Server Monitor -- Real-time SSH server monitoring
• Getting Started -- First connection tutorial
• Local -- Local Shell and Serial