I'm having a tough time with the GetPreSignedURL method while developing a C# application that interacts with an S3 bucket located in the us-west-1 region. The function works perfectly in my local development setup, but when I deploy it to the production server in the UK (currently UTC+1), I run into issues. Specifically, I get an "Object reference not set to an instance of an object" error right when I call the GetPreSignedURL method. Without the 'Expires' parameter, I receive an error saying "Expires cannot be null!". Even when I try to set Expires to UtcNow + 10 hours, it still throws the same exception. All other operations, like ListObjectsV2Async, are working fine, indicating that my bucket, endpoint, and credentials are correct. I've only seen one other case similar to this where the resolution was vague, mentioning a timezone fix. What could be going wrong here? Any insights would be greatly appreciated!
2 Answers
I experienced a similar problem, and for me, it turned out to be a permissions issue. Double-check the IAM policy attached to the account generating the URL to ensure you have access to that specific S3 operation.
Make sure that the AWS account used to generate the pre-signed URLs has the PutObject permission for your S3 bucket. Even if other requests are working, permissions might be different for generating pre-signed URLs, and that could be the issue.
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