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how-to-configure-hardened-debian-server/README.md
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Title: How to configure hardened Debian server Title: How to configure hardened Debian server
Description: Learn how to configure hardened Debian server. Description: Learn how to configure hardened Debian server.
Author: Sun Knudsen <https://github.com/sunknudsen> Author: Sun Knudsen <https://github.com/sunknudsen>
Contributors: Sun Knudsen <https://github.com/sunknudsen> Contributors: Sun Knudsen <https://github.com/sunknudsen>, Go Compile <https://github.com/go-compile>
Reviewers: Reviewers: Go Compile <https://github.com/go-compile>
Publication date: 2020-11-27T10:00:26.806Z Publication date: 2020-11-27T10:00:26.806Z
Listed: true Listed: true
Pinned: Pinned:
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```shell ```shell
sed -i -E 's/^(#)?PermitRootLogin (prohibit-password|yes)/PermitRootLogin no/' /etc/ssh/sshd_config sed -i -E 's/^(#)?PermitRootLogin (prohibit-password|yes)/PermitRootLogin no/' /etc/ssh/sshd_config
sed -i -E 's/^(#)?PasswordAuthentication yes/PasswordAuthentication no/' /etc/ssh/sshd_config sed -i -E 's/^(#)?PasswordAuthentication yes/PasswordAuthentication no/' /etc/ssh/sshd_config
```
#### Limit login attempts and use `Ed25519` host key
```shell
sed -i -E 's/^(#)?MaxAuthTries 6/MaxAuthTries 2/' /etc/ssh/sshd_config
sed -i -E 's/^(#)?HostKey \/etc\/ssh\/ssh_host_ed25519_key/HostKey \/etc\/ssh\/ssh_host_ed25519_key/' /etc/ssh/sshd_config
```
#### Restart SSH daemon
```shell
systemctl restart ssh systemctl restart ssh
``` ```