{"id":2799,"date":"2025-06-19T02:53:30","date_gmt":"2025-06-18T23:53:30","guid":{"rendered":"https:\/\/wafatech.sa\/blog\/linux\/linux-security\/enhancing-ssh-security-best-practices-for-linux-server-hardening\/"},"modified":"2025-06-19T02:53:30","modified_gmt":"2025-06-18T23:53:30","slug":"enhancing-ssh-security-best-practices-for-linux-server-hardening","status":"publish","type":"post","link":"https:\/\/wafatech.sa\/blog\/linux\/linux-security\/enhancing-ssh-security-best-practices-for-linux-server-hardening\/","title":{"rendered":"Enhancing SSH Security: Best Practices for Linux Server Hardening"},"content":{"rendered":"


\n<\/p>\n

In today\u2019s digital landscape, securing your servers is more important than ever. One of the most common methods for remote administration of Linux servers is SSH (Secure Shell). While SSH provides a robust and encrypted way for remote logins, it is not immune to attacks. In this article, we will explore best practices for hardening SSH to enhance the security of your Linux servers.<\/p>\n

<\/p>\n

1. Change the Default SSH Port<\/h3>\n

<\/p>\n

By default, SSH operates on port 22. Changing this port can reduce the likelihood of automated attacks and can be one of the first lines of defense. Here\u2019s how to do it:<\/p>\n

<\/p>\n

    <\/p>\n
  1. \n

    Open the SSH configuration file:
    \nbash
    \nsudo nano \/etc\/ssh\/sshd_config<\/p>\n

    \n<\/li>\n

    <\/p>\n

  2. \n

    Look for the line that specifies #Port 22<\/code> and change it to:
    \nplaintext
    \nPort 2222 # Choose a port number between 1024 and 65535<\/p>\n

    \n<\/li>\n

    <\/p>\n

  3. Save the changes and restart the SSH service:
    \nbash
    \nsudo systemctl restart sshd<\/li>\n

    \n<\/ol>\n

    <\/p>\n

    2. Disable Root Login<\/h3>\n

    <\/p>\n

    Allowing direct root login via SSH can be a significant security risk. Instead, create a user with sudo privileges.<\/p>\n

    <\/p>\n

      <\/p>\n
    1. \n

      Again, open the SSH configuration file:
      \nbash
      \nsudo nano \/etc\/ssh\/sshd_config<\/p>\n

      \n<\/li>\n

      <\/p>\n

    2. \n

      Find the line:
      \nplaintext
      \nPermitRootLogin yes<\/p>\n

      <\/p>\n

      Change it to:
      \nplaintext
      \nPermitRootLogin no<\/p>\n

      \n<\/li>\n

      <\/p>\n

    3. Save and exit, then restart the SSH service.<\/li>\n

      \n<\/ol>\n

      <\/p>\n

      3. Use Key-Based Authentication<\/h3>\n

      <\/p>\n

      Password-based authentication can be susceptible to brute-force attacks. Using SSH key pairs adds an additional layer of security.<\/p>\n

      <\/p>\n

        <\/p>\n
      1. \n

        Generate a key pair on your local machine:
        \nbash
        \nssh-keygen -t rsa -b 4096<\/p>\n

        \n<\/li>\n

        <\/p>\n

      2. \n

        Copy the public key to your server:
        \nbash
        \nssh-copy-id username@your_server_ip<\/p>\n

        \n<\/li>\n

        <\/p>\n

      3. \n

        Once confirmed, disable password authentication in the SSH configuration:
        \nplaintext
        \nPasswordAuthentication no<\/p>\n

        \n<\/li>\n

        <\/p>\n

      4. Restart SSH.<\/li>\n

        \n<\/ol>\n

        <\/p>\n

        4. Enable Two-Factor Authentication (2FA)<\/h3>\n

        <\/p>\n

        Adding a second layer of authentication can bolster your server\u2019s security. Tools like Google Authenticator can be integrated easily.<\/p>\n

        <\/p>\n

          <\/p>\n
        1. \n

          Install the required package:
          \nbash
          \nsudo apt install libpam-google-authenticator<\/p>\n

          \n<\/li>\n

          <\/p>\n

        2. \n

          Run Google Authenticator on your server:
          \nbash
          \ngoogle-authenticator<\/p>\n

          \n<\/li>\n

          <\/p>\n

        3. Follow the prompts to set it up.<\/li>\n

          <\/p>\n

        4. \n

          Modify the PAM configuration:
          \nbash
          \nsudo nano \/etc\/pam.d\/sshd<\/p>\n

          <\/p>\n

          Add:
          \nplaintext
          \nauth required pam_google_authenticator.so<\/p>\n

          \n<\/li>\n

          <\/p>\n

        5. Save and restart SSH.<\/li>\n

          \n<\/ol>\n

          <\/p>\n

          5. Implement Fail2ban<\/h3>\n

          <\/p>\n

          Fail2ban is an intrusion prevention software framework that protects from brute-force attacks.<\/p>\n

          <\/p>\n

            <\/p>\n
          1. \n

            Install Fail2ban:
            \nbash
            \nsudo apt install fail2ban<\/p>\n

            \n<\/li>\n

            <\/p>\n

          2. \n

            Configure it by creating a local configuration file:
            \nbash
            \nsudo cp \/etc\/fail2ban\/jail.conf \/etc\/fail2ban\/jail.local<\/p>\n

            \n<\/li>\n

            <\/p>\n

          3. \n

            Edit the configuration file and enable the SSH jail:
            \nbash
            \nsudo nano \/etc\/fail2ban\/jail.local<\/p>\n

            <\/p>\n

            Find the [sshd]<\/code> section and make sure it looks like this:
            \nplaintext
            \n[sshd]
            \nenabled = true<\/p>\n

            \n<\/li>\n

            <\/p>\n

          4. Restart Fail2ban:
            \nbash
            \nsudo systemctl restart fail2ban<\/li>\n

            \n<\/ol>\n

            <\/p>\n

            6. Regularly Update Your System<\/h3>\n

            <\/p>\n

            Ensuring your system is always running the latest software is crucial for security. Regularly apply updates by running:<\/p>\n

            <\/p>\n

            bash
            \nsudo apt update && sudo apt upgrade -y<\/p>\n

            <\/p>\n

            7. Monitor SSH Logins<\/h3>\n

            <\/p>\n

            Regular monitoring of your SSH login attempts can offer valuable insight into any unauthorized access. Use tools like fail2ban<\/code>, or scrutinize the logs stored in \/var\/log\/auth.log<\/code>.<\/p>\n

            <\/p>\n

            Conclusion<\/h3>\n

            <\/p>\n

            By implementing these best practices, you can significantly bolster the security of your Linux servers against unauthorized access. Each layer added, from changing the default port to employing two-factor authentication, hardens your server and creates a resilient defense against potential threats. Remember, security is not a one-time endeavor; it requires continuous monitoring and improvement. <\/p>\n

            <\/p>\n

            Staying informed about the latest security trends and threats is essential for any IT professional. With a well-secured SSH configuration, you can rest assured that your Linux servers are better protected against malign actors. <\/p>\n

            <\/p>\n

            For more tech insights and advanced security practices, stay tuned to the WafaTech Blog!<\/p>\n\n","protected":false},"excerpt":{"rendered":"

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In this article, we will explore best practices for hardening […]<\/p>\n","protected":false},"author":2,"featured_media":2800,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","inline_featured_image":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[22],"tags":[290,319,265,237,291,266,770],"class_list":["post-2799","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-linux-security","tag-enhancing","tag-hardening","tag-linux","tag-practices","tag-security","tag-server","tag-ssh","et-has-post-format-content","et_post_format-et-post-format-standard"],"yoast_head":"\nEnhancing SSH Security: Best Practices for Linux Server Hardening - WafaTech Blogs<\/title>\n<meta name=\"description\" content=\"Enhancing SSH Security: Best Practices for Linux Server Hardening %\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/wafatech.sa\/blog\/linux\/linux-security\/enhancing-ssh-security-best-practices-for-linux-server-hardening\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Enhancing SSH Security: Best Practices for Linux Server Hardening\" \/>\n<meta property=\"og:description\" content=\"Enhancing SSH Security: Best Practices for Linux Server Hardening %\" \/>\n<meta property=\"og:url\" content=\"https:\/\/wafatech.sa\/blog\/linux\/linux-security\/enhancing-ssh-security-best-practices-for-linux-server-hardening\/\" \/>\n<meta property=\"og:site_name\" content=\"WafaTech Blogs\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/people\/WafaTech\/61560546351289\/\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-18T23:53:30+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/wafatech.sa\/blog\/wp-content\/uploads\/2024\/06\/logo_big.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"2221\" \/>\n\t<meta property=\"og:image:height\" content=\"482\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/webp\" \/>\n<meta name=\"author\" content=\"WafaTech SA\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@wafatech_sa\" \/>\n<meta name=\"twitter:site\" content=\"@wafatech_sa\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"WafaTech SA\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":[\"Article\",\"BlogPosting\"],\"@id\":\"https:\\\/\\\/wafatech.sa\\\/blog\\\/linux\\\/linux-security\\\/enhancing-ssh-security-best-practices-for-linux-server-hardening\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/wafatech.sa\\\/blog\\\/linux\\\/linux-security\\\/enhancing-ssh-security-best-practices-for-linux-server-hardening\\\/\"},\"author\":{\"name\":\"WafaTech SA\",\"@id\":\"https:\\\/\\\/wafatech.sa\\\/blog\\\/#\\\/schema\\\/person\\\/1a5761fc0feb63ab59d295d7c2648f06\"},\"headline\":\"Enhancing SSH Security: Best Practices for Linux Server Hardening\",\"datePublished\":\"2025-06-18T23:53:30+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/wafatech.sa\\\/blog\\\/linux\\\/linux-security\\\/enhancing-ssh-security-best-practices-for-linux-server-hardening\\\/\"},\"wordCount\":591,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/wafatech.sa\\\/blog\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/wafatech.sa\\\/blog\\\/linux\\\/linux-security\\\/enhancing-ssh-security-best-practices-for-linux-server-hardening\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/wafatech.sa\\\/blog\\\/wp-content\\\/uploads\\\/2025\\\/06\\\/Enhancing-SSH-Security-Best-Practices-for-Linux-Server-Hardening.png\",\"keywords\":[\"Enhancing\",\"Hardening\",\"Linux\",\"Practices\",\"Security\",\"Server\",\"SSH\"],\"articleSection\":[\"Linux Security\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/wafatech.sa\\\/blog\\\/linux\\\/linux-security\\\/enhancing-ssh-security-best-practices-for-linux-server-hardening\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/wafatech.sa\\\/blog\\\/linux\\\/linux-security\\\/enhancing-ssh-security-best-practices-for-linux-server-hardening\\\/\",\"url\":\"https:\\\/\\\/wafatech.sa\\\/blog\\\/linux\\\/linux-security\\\/enhancing-ssh-security-best-practices-for-linux-server-hardening\\\/\",\"name\":\"Enhancing SSH Security: Best Practices for Linux Server Hardening - 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