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APURV

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Apurv Gujjar
Apurv GujjarDevOps & Cloud Engineer
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Interview DocumentationNetworkingScenario: What happens if an HTTPS certificate expires? How do you fix it?
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Q3

Scenario: What happens if an HTTPS certificate expires? How do you fix it?

💬Answer
  • Impact: User web browsers will display a warning page stating "Your connection is not private," blocking users from accessing the site. Automated API requests will fail with TLS handshake errors.
  • Resolution:
    1. Generate a new CSR (Certificate Signing Request).
    2. Request a renewal from your CA (e.g., Let's Encrypt, DigiCert, AWS Certificate Manager).
    3. Deploy the new certificate and private key to the web server, load balancer, or CDN.
    4. Reload the web server configuration (e.g., systemctl reload nginx) to apply changes.
    5. Mitigation: Implement automated certificate renewals using tools like certbot or AWS ACM auto-renewal.

Related Networking Questions

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Q1

Explain the OSI Model.

Q2

Explain the TCP/IP Model.

Q3

Compare TCP and UDP.

Q4

What is a socket?

Apurv Gujjar - DevOps & Cloud Engineer
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Apurv Gujjar

DevOps & Cloud Engineer

Specialized in:DevOpsAWSGCPKubernetesTerraformDocker
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