AWS C++ S3 SDK PutObjectRequest unable to connect to endpoint - c++

Question

In working with the AWS C++ SDK I ran into an issue where trying to execute a PutObjectRequest complains that it is "unable to connect to endpoint" when uploaded more than ~400KB.
Aws::Client::ClientConfiguration clientConfig;
clientConfig.scheme = Aws::Http::Scheme::HTTPS;
clientConfig.region = Aws::Region::US_EAST_1;
Aws::S3::S3Client s3Client(clientConfig);
Aws::S3::Model::PutObjectRequest putObjectRequest;
putObjectRequest.SetBucket("mybucket");
putObjectRequest.SetKey("mykey");
typedef boost::iostreams::basic_array_source<char> Device;
boost::iostreams::stream_buffer<Device> stmbuf(compressedData, dataSize);
std::iostream *stm = new std::iostream(&stmbuf);
putObjectRequest.SetBody(std::shared_ptr<Aws::IOStream>(stm));
putObjectRequest.SetContentLength(dataSize);
Aws::S3::Model::PutObjectOutcome outcome = s3Client.PutObject(putObjectRequest);
As long as my data is less than ~400KB it gets uploaded into a file on S3 but beyond that it is unable to connect to endpoint. I should be able to upload up to 5GB in one PutObjectRequest.
Any thoughts?
Edit:
Responding to #JonathanHenson's comment, the AWS log shows this timeout error repeatedly:
[DEBUG] 2016-08-04 13:42:03 AWSClient [0x700000081000] Request Successfully signed
[TRACE] 2016-08-04 13:42:03 CurlHttpClient [0x700000081000] Making request to https://s3.amazonaws.com/mybucket/myfile
[TRACE] 2016-08-04 13:42:03 CurlHttpClient [0x700000081000] Including headers:
[TRACE] 2016-08-04 13:42:03 CurlHttpClient [0x700000081000] content-length: 3151261
[TRACE] 2016-08-04 13:42:03 CurlHttpClient [0x700000081000] content-type: binary/octet-stream
[TRACE] 2016-08-04 13:42:03 CurlHttpClient [0x700000081000] host: s3.amazonaws.com
[TRACE] 2016-08-04 13:42:03 CurlHttpClient [0x700000081000] user-agent: aws-sdk-cpp/0.13.9 Darwin/15.6.0 x86_64
[DEBUG] 2016-08-04 13:42:03 CurlHandleContainer [0x700000081000] Attempting to acquire curl connection.
[DEBUG] 2016-08-04 13:42:03 CurlHandleContainer [0x700000081000] Returning connection handle 0x10b09cc00
[DEBUG] 2016-08-04 13:42:03 CurlHttpClient [0x700000081000] Obtained connection handle 0x10b09cc00
[TRACE] 2016-08-04 13:42:03 CurlHttpClient [0x700000081000] HTTP/1.1 100 Continue
[TRACE] 2016-08-04 13:42:03 CurlHttpClient [0x700000081000]
[ERROR] 2016-08-04 13:42:06 CurlHttpClient [0x700000081000] Curl returned error code 28
[DEBUG] 2016-08-04 13:42:06 CurlHandleContainer [0x700000081000] Releasing curl handle 0x10b09cc00
[DEBUG] 2016-08-04 13:42:06 CurlHandleContainer [0x700000081000] Notifying waiting threads.
[DEBUG] 2016-08-04 13:42:06 AWSClient [0x700000081000] Request returned error. Attempting to generate appropriate error codes from response
[WARN] 2016-08-04 13:42:06 AWSClient [0x700000081000] Request failed, now waiting 12800 ms before attempting again.
[DEBUG] 2016-08-04 13:42:19 InstanceProfileCredentialsProvider [0x700000081000] Checking if latest credential pull has expired.

Answer 1

Ultimately what fixed this for me was setting the request timeout. The request time out needs to be long enough for your entire transfer to finish. If you are transferring large files on a slow internet connection make sure the request timeout is long enough to allow those files to transfer.
Aws::Client::ClientConfiguration clientConfig;
clientConfig.scheme = Aws::Http::Scheme::HTTPS;
clientConfig.region = Aws::Region::US_EAST_1;
clientConfig.connectTimeoutMs = 30000;
clientConfig.requestTimoutMs = 600000;

Answer 2

Tweak your config file to below.And see it will work.
Aws::Client::ClientConfiguration clientConfig;
clientConfig.scheme = Aws::Http::Scheme::HTTPS;
clientConfig.region = Aws::Region::US_EAST_1;
clientConfig.connectTimeoutMs = 30000;
Aws::S3::S3Client s3Client(clientConfig);
Aws::S3::Model::PutObjectRequest putObjectRequest;
putObjectRequest.SetBucket("mybucket");
putObjectRequest.SetKey("mykey");
typedef boost::iostreams::basic_array_source<char> Device;
boost::iostreams::stream_buffer<Device> stmbuf(compressedData, dataSize);
std::iostream *stm = new std::iostream(&stmbuf);
putObjectRequest.SetBody(std::shared_ptr<Aws::IOStream>(stm));
putObjectRequest.SetContentLength(dataSize);
Aws::S3::Model::PutObjectOutcome outcome = s3Client.PutObject(putObjectRequest);