The CloudFront Distribution did not handle requests from outside for two hours 18.01.25.

There are several possible reasons for the unusual behavior you've experienced with your CloudFront distribution. Let's explore some potential causes:

1. Geographic Restrictions: If you have geographic restrictions configured on your CloudFront distribution, it's possible that they were inadvertently applied or misconfigured during that time period. This could result in traffic from certain regions being blocked.

2. Edge Location Issues: CloudFront uses a network of edge locations to serve content. If there were problems with specific edge locations, it could affect traffic from certain areas while leaving others unaffected.

3. Caching Issues: CloudFront caches responses, including error responses. If there was a temporary issue that caused errors, these might have been cached and continued to be served even after the original problem was resolved.

4. Origin Server Problems: If your origin server (e.g., an S3 bucket) was experiencing issues, it could have affected CloudFront's ability to serve content.

5. Routing or DNS Issues: Problems with DNS or routing could have affected how traffic was directed to your CloudFront distribution.

6. CloudFront Service Issues: Although rare, there could have been a partial service disruption in CloudFront that affected your distribution.

7. Logging and Metrics Discrepancies: The blank space in your metrics could indicate a problem with data collection or reporting rather than an actual service outage.

To investigate further:

1. Check your CloudFront distribution settings, particularly any geographic restrictions or security features that might have been activated during that time.

2. Review your CloudFront access logs for the affected period. These logs provide detailed information about requests and can help identify patterns or errors.

3. Verify if there were any changes or updates made to your distribution or origin server around that time.

4. Check the AWS Service Health Dashboard for any reported issues with CloudFront or related services during that period.

5. Consider enabling additional CloudFront metrics or real-time logging for more detailed monitoring in the future.

6. If the issue persists or recurs, contact AWS Support for a more in-depth investigation, as they can access more detailed information about your distribution's performance and any potential service-wide issues.
   Sources
   Logging and monitoring in CloudFront - Secure Content Delivery with Amazon CloudFront
   Issue with Geographic Restrictions on CloudFront Distribution | AWS re:Post