amazon s3 upload file time out

If your endpoint is behind a VPC it will also silently error out. You can add a new VPC endpoint here for s3

https://aws.amazon.com/blogs/aws/new-vpc-endpoint-for-amazon-s3/

Is it possible that IOUtils.toByteArray is draining your input stream so that there is no more data to be read from it when the service call is made? In that case a stream.reset() would fix the issue.

But if you're just uploading a file (as opposed to an arbitrary InputStream), you can use the simpler form of AmazonS3.putObject() that takes a File, and then you won't need to compute the content length at all.

http://docs.amazonwebservices.com/AWSJavaSDK/latest/javadoc/com/amazonaws/services/s3/AmazonS3.html#putObject(java.lang.String, java.lang.String, java.io.File)

This will automatically retry any such network errors several times. You can tweak how many retries the client uses by instantiating it with a ClientConfiguration object.

http://docs.amazonwebservices.com/AWSJavaSDK/latest/javadoc/com/amazonaws/ClientConfiguration.html#setMaxErrorRetry(int)