How do I resolve "read timeout on endpoint URL" during a bulk upload to Panther?

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Issue

When trying to run a bulk upload to Panther, timeout errors such as the following occur:

Error: [root]: failed to upload to backend: Read timeout on endpoint URL: "https://lambda.us-east-1.amazonaws.com/2015-03-31/functions/panther-analysis-api/invocations"

What can I check to ensure that I am using asynchronous bulk uploads?

Resolution

This issue can occur when you are not running the asynchronous version of upload. To ensure that you are running the asynchronous version of upload, please check that you are:

Using Panther Analysis Tool (PAT) version 0.22.0 or newer
Using an API Token with Bulk Upload permissions
Not using the --no-async argument on the upload command

Cause

Bulk upload and timeout issues can occur when you are not running the asynchronous version of upload.