Thomas' Notes

Contents:

  • Introduction
  • Software Requirements
  • Infrastructure
  • Application Platform
  • Docker
  • Kubernetes
  • Ansible
  • JavaScript
  • Java
  • Python
  • Enterprise Integration
  • DevOps
  • IT Security
    • IT Security Overview
    • A Glossary of Security Terms
    • Public Key Infrastructure
    • Generating HTTPS Certificates
    • Cross Origin Resource Sharing (CORS)
    • JSON Web Token (JWT)
    • Kerberos
    • Checking SSH login failures
  • Artificial Intelligence
  • Data
  • Project Management
  • Non Technical Stuff
Thomas' Notes
  • IT Security

IT Security

  • IT Security Overview
    • Benefits of a Standard Identity Protocol
    • Are certificates better than passwords?
    • The Three As
  • A Glossary of Security Terms
  • Public Key Infrastructure
    • PKI Glossary
    • OpenSSL commands
    • PKI Concepts
    • Setting up a Private PKI
    • Alternate way for PKI Setup
    • root-ca.conf
  • Generating HTTPS Certificates
    • Self Signed HTTPS key
    • Let’s Encrypt Certificate
    • Installing NGINX and the site
    • Installing Certbot and apply for the certificate
  • Cross Origin Resource Sharing (CORS)
    • Introduction
    • Concepts
    • CORS Server Options
  • JSON Web Token (JWT)
    • JWT Concepts
    • JWT Best Practises
  • Kerberos
    • An Overview of Kerberos
    • Kerberos Glossary
    • Kerberos Sequence Diagrams

Checking SSH login failures

sudo grep "Failed password" /var/log/auth.log

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© Copyright 2024, Big Tom. Updated Dec 2024.

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