# Connect to Linux VM Instance via SSH Key

If you using Windows, you must use a third-party tools. The following instructions show how to connect to Linux VM using PuTTY with SSH key.

* Open **PuTTY** on your computer.

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* In the **Host Name** field, enter the **Public IP Address** of the VM that you want to connect, also the port number.

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* In the category list, **Expand SSH** and click **Auth**.

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* Click **Browser**, choose private key that you saved before. Then click **Open**.

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* After that, click **open** to connect to your VM Instance.

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* It will be open the login session to your VM.

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* Try login with user root and enter your passphrase key.

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* If there is a notification **“Please login as the user “centos” rather than the user “root””**, so you only can login using “centos” user.

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* Please try login using “centos” user, now you can login to your VM instance.

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