How to fix failed downloading terraform in Terraform

Check that you have basic network connectivity:

ping releases.hashicorp.com

If this fails, you have a network issue. Try:
- Checking your firewall/VPN settings
- Switching to a different network
- Restarting your network interface

Review your Terraform configuration for provider version constraints:

terraform {
  required_providers {
    aws = {
      source  = "hashicorp/aws"
      version = "~> 5.0"  # Check if this version exists
    }
  }
}

Visit the HashiCorp Registry (https://registry.terraform.io) to verify the requested version exists. If using a version that's too new or doesn't exist, update your configuration.

Remove cached plugins and re-initialize:

rm -rf .terraform/
terraform init

This forces Terraform to re-download all providers and modules fresh. If you're behind a proxy, also try:

terraform init -upgrade

If you're behind a corporate proxy, set HTTP proxy environment variables:

# Linux/macOS
export HTTP_PROXY=http://proxy.company.com:8080
export HTTPS_PROXY=http://proxy.company.com:8080

# Windows (PowerShell)
$env:HTTP_PROXY="http://proxy.company.com:8080"
$env:HTTPS_PROXY="http://proxy.company.com:8080"

Then retry:

terraform init

System certificate issues can cause download failures:

# Linux (Debian/Ubuntu)
sudo apt-get update && sudo apt-get install ca-certificates

# Linux (RHEL/CentOS)
sudo yum update ca-certificates

# macOS
# Update to latest macOS or manually update certificates

On Windows, ensure your system certificates are current by running Windows Update.

If your environment has strict download restrictions, use a local Terraform registry mirror:

terraform {
  cloud {
    organization = "my-org"
  }
}

Or configure a network mirror:

export TF_NETWORK_MIRROR=https://internal-mirror.company.com

Contact your infrastructure team for mirror setup and credentials.