AWS.SDK TransferUtility.Upload hangs

I have the following code

Dim fileTransferUtility = New TransferUtility(new AmazonS3Client(credentials,region))
Dim fileTransferUtilityRequest = New TransferUtilityUploadRequest With {
   .BucketName = bucketName,
   .FilePath = sourceFileName,
   .PartSize = 6291456,
   .Key = awsFileKey
}
fileTransferUtility.Upload(fileTransferUtilityRequest)

This code worked just fine up until

• AWSSDK.Core version="3.3.107.5"
• AWSSDK.S3 version="3.3.111.6"

But hangs starting from

• AWSSDK.Core version="3.3.107.6"
• AWSSDK.S3 version="3.3.111.6"

It does never return, with exception or anything. It simply hangs.

The environment is

• OS Info: Windows 10 Pro, Windows Server 2012 +
• Build Environment Visual Studio 2019, 16.6.2
• Targeted .NET Platform: 4.7.1

Did anyone encountered this problem, and found any solution?

I created an issue on AWS.SDK at https://github.com/aws/aws-sdk-net/issues/1648

Issue fixed with versions AWSSDK.Core 3.3.107.16 AWSSDK.S3 3.3.111.17