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Troubleshooting AWS S3 Access Denied Errors

Jun 1, 2025

Lecture Notes: Understanding Access Denied Errors in AWS S3

Introduction

  • Topic: Understanding and troubleshooting 'Access Denied' errors in AWS S3.
  • Context: Occurs when trying to access a resource with expired credentials or incorrect permissions.

Key Concepts

AWS S3 Access Denied Error

  • Error Code: AccessDenied
  • Common Causes:
    • Expired request credentials
    • Invalid permissions or policies
    • Incorrectly configured bucket policies

Error Components

  • Message: "Request has expired"
  • Expiration Time: X-Amz-Expires – Specifies the duration for which the request is valid.
  • Server Time: Compares against expiration to determine request validity.

Example Case

  • Scenario:
    • Request attempted after expiration date.
    • Expires Field: 2025-05-30T14:24:45Z
    • Server Time: 2025-06-01T16:37:13Z
    • Resulted in access denial.

Troubleshooting Steps

Verify Credentials

  • Ensure that AWS credentials are valid and up to date.

Check Permissions

  • Policies: Verify IAM roles and policies attached to the user or service.
  • Bucket Policies: Ensure correct permissions are set for accessing the S3 bucket.

Review Request Configuration

  • Expiration Settings: Confirm if the X-Amz-Expires parameter aligns with access needs.
  • Time Synchronization: Ensure server clock is accurate to avoid discrepancies.

Conclusion

  • Preventive Measures:
    • Regular updates and checks on credentials and policies.
    • Proper time management and synchronization of server clocks.

Additional Resources

  • AWS Documentation and support for troubleshooting S3 access issues.

View note sourcehttps://myschoolmanagement.s3.eu-west-1.amazonaws.com/strasbourg/1232/97631/2023%20MATH%203%20A%20EN%20%20-%20Solutions.pdf?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Security-Token=IQoJb3JpZ2luX2VjEE4aCWV1LXdlc3QtMSJIMEYCIQDEkP6XKUqA9FhoY8ITYDL9Z2w8iFSWJg53dxsUsDSw5QIhAL5x6bjZ804IgAGAIYux5m%2FCasAu3CpSyq0dt6Cz1TlrKrkFCBcQABoMMDYyNjM3ODI4MTc4Igyxgfc6inCxbAtsrDAqlgUBm19hF26kXr4U9qiEzXTFe6J9R0%2FVd%2FI7iL0WUHqRbrDCikuzqAbDVecfayB5MQG3jCR4KTkmCXvydj%2BIbbLRTNRY7hH0IleJQVq2Mz0AIsAooGgKUVbATlxlQ1niHhm8ryEv%2BFgfBWm%2F2%2F9iW2HLZT3JGu3hm8TL4rChb97KPUGg3ty6EWWG6DTQ9QSBXiPQ1Xyk%2BXZoDi%2B85Cb%2FoSO30D2cYDK6G%2FN7nPsVdlDTH%2BiZ1tkIMRjKYDK%2FJlB%2Ff9LCF2fVAXWg13CokzOWl%2FrSjy1C6zpqbYWdTqAQI0V6u0d9RrOxwXqbXAAtmff%2Fez6rJIShc1Mxyl0eKrwUGbWJPZ2oDWb1pDikwgpiDINe5PeU7hdwxK3fJ4%2Fbzv3lm%2BIT3xb7n3nPWPerCf%2BDWjWtnFrlbY35YHHizfplOENVXAN4wZTnfnUeYvBonWlG7lVO%2FyTJJhc%2BBIEieU9KnrOQLJ4ysXlwjFDrJ4PuIkik9WfDzVT%2Fys9rKrC9KjwJZOmZEgA4Vz1b7hOIsUMTA7ps2vnlQ7qMLeh53d6jWdGw7KfmiZDJisehfPAavvKvpckDxc1pG3%2F767Wid7r2LLehqwINmJPKpiVuxFvmbm9TRMwGgGibbHQGppnsS5BONH4eSD0ii9u2UBS2BADk4R37xjIesj48b9N4e5N6Pp74HzMmR%2B6SUold5%2ByK7L%2FZNQkWkiHuhdfnuZXNKtw4QkzaG25YMBduN%2F9lbSOaDkmzfkR10Xl7oBqNKOZMw8m9XGuS9RQYRDlKN0uhROXCI4jOpWxwtq2P64wW6VSavt0W31x24TOYtFv6Rc3WkuXQqBEG1JNiL011gdwaGpIw1mmDvG6kX6Z%2BwLB4kDKRj7b6yKxgbBZnCzDOl8fBBjqwAdpCtrxYuCQOqWiOw2un5yrnwNJfreSBq8oY92kDiwDk6k4UEC3ZvN8%2Fu1nhamYTsu23FAr6LjWzZoZw1PRoTKmISzT0Xyse%2BqWH3ZYHAC6UkkNZZ6EcrVbQgcOrT0doWSwAa7%2F90PQO3iXB7PXPQ1L0hdXkku7Up7FM2kjq1lDrPNLGI%2FhFWdtiWeMqRGWS1J6VXARSx7PX3pfQFNGXwxKVzSV34rgXMX5DGOljXLxO&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=ASIAQ5FMBNBJCTCTLRCE%2F20250524%2Feu-west-1%2Fs3%2Faws4_request&X-Amz-Date=20250524T142445Z&X-Amz-SignedHeaders=host&X-Amz-Expires=518400&X-Amz-Signature=76ef316c234e6101669307affc91f5a39d647a1aff849837f0e591881753460f