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I cannot tell whether you fell under a deny list or what... but to be honest I would try to check on this points and see if something rings...
- Verify that outbound access is allowed on port 443 in your EC2 security group. SNS uses port 443 for HTTPS connections.
- Check for any network ACLs that may be blocking outbound traffic to the SNS endpoint IP range.
- Try simplifying your code and running basic SNS publish/subscribe tests to isolate where the issue may be occurring.
- Consider using alternative SNS endpoints in different regions in case the primary endpoint has availability problems.
- Review your AWS service health dashboard or service health history for any known issues on the day you encountered this problem.
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- demandé il y a un an
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Thanks for your reply. After few days it's working again (without making any changes from my side). Hard to say what happened.