The answer is to increase the socket timeout in the AWS SDK configuration and ensure the network path, such as an Application Load Balancer, has a higher idle timeout. This resolves the S3 PutObject request timeout because the error indicates the socket connection to the server was idle too long, often caused by a proxy or load balancer closing the connection before the SDK’s own timeout expires. On the AWS Certified Developer Associate DVA-C02 exam, this scenario tests your understanding of how network intermediaries like ALBs interact with SDK timeout settings—a common trap is confusing this with throttling or permissions issues. Remember that the S3 metrics showed no throttling, so the root cause is a mismatched timeout between the load balancer and the SDK’s socket timeout. A helpful memory tip: “ALB idle timeout must exceed SDK socket timeout to avoid a silent disconnect.”
DVA-C02 Troubleshooting and Optimization Practice Question
This DVA-C02 practice question tests your understanding of troubleshooting and optimization. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A developer notices that an S3 bucket's 'PutObject' API calls are failing intermittently for a specific application. The application uses the AWS SDK for Java to upload files. The error message is 'RequestTimeout: Your socket connection to the server was not read from or written to within the timeout period.' The bucket is in the same region as the application. The developer checks the S3 metrics and sees no throttling errors. The application runs on EC2 instances behind an ALB. The developer suspects a network issue. What should the developer do to resolve the issue?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Increase the socket timeout in the AWS SDK configuration and ensure the network path (ALB) has a higher idle timeout.
The 'RequestTimeout' error indicates that the connection is idle for too long. This often happens when using a proxy or load balancer that has a shorter idle timeout than the S3 SDK's timeout. Option A is correct: increasing the S3 client's timeout settings or using HTTP keep-alive. Option B is wrong because the bucket policy is not related to timeouts. Option C is wrong because S3 Transfer Acceleration is for large files over long distances, not for timeouts. Option D is wrong because the issue is not about permissions.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Add a bucket policy that grants s3:PutObject to the application's IAM role.
Why it's wrong here
Permissions are not the issue; the error is a timeout.
✗
Use an S3 VPC endpoint to improve network reliability.
Why it's wrong here
VPC endpoints improve security and reliability but do not address idle timeouts.
✓
Increase the socket timeout in the AWS SDK configuration and ensure the network path (ALB) has a higher idle timeout.
Why this is correct
The ALB may have a default idle timeout of 60 seconds; increasing it and adjusting SDK timeout can prevent the error.
Related concept
Static NAT maps one inside address to one outside address.
✗
Enable S3 Transfer Acceleration on the bucket and update the application to use the accelerated endpoint.
Why it's wrong here
Transfer Acceleration is for faster uploads, not for timeouts.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DVA-C02 NAT questions on configuration and troubleshooting.
Troubleshooting and Optimization — This question tests Troubleshooting and Optimization — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Increase the socket timeout in the AWS SDK configuration and ensure the network path (ALB) has a higher idle timeout. — The 'RequestTimeout' error indicates that the connection is idle for too long. This often happens when using a proxy or load balancer that has a shorter idle timeout than the S3 SDK's timeout. Option A is correct: increasing the S3 client's timeout settings or using HTTP keep-alive. Option B is wrong because the bucket policy is not related to timeouts. Option C is wrong because S3 Transfer Acceleration is for large files over long distances, not for timeouts. Option D is wrong because the issue is not about permissions.
What should I do if I get this DVA-C02 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DVA-C02 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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