# Login Overview

#### Constraints

- Only a running ECS can be logged in.
- For ECSs created using public images, login usernames, passwords, and constraints vary depending on OSs running on the ECSs. For details, see Public Images Introduction.

#### Login Modes

Select a login mode as required and log in to the target ECS.

Table 1 Linux ECS login modes
ECS OS | Local OS | Connection Method | Requirement
--- | --- | --- | ---

Linux

Windows

Use a remote login tool, such as PuTTY or Xshell.

- Password-authenticated: Logging In to the Linux ECS from a Local Windows Server
- Key-pair-authenticated: Logging In to the Linux ECS from Local Windows

The target ECS has an EIP bound.

Linux

Run commands.

- Password-authenticated: Logging In to the Linux ECS from a Local Linux Server
- Key-pair-authenticated: Logging In to the Linux ECS from Local Linux

Windows | Use the remote login function available on the management console. Login Using VNC | No EIP is required.

Parent topic: Logging In to a Linux ECS