The error message "net/http: request canceled while waiting for connection" in Terraform typically indicates that there was a problem with the HTTP request to the Terraform backend or provider API, resulting in the connection being canceled. This can happen due to several reasons such as network issues, API rate limits, or incorrect configuration.

Here are several steps to diagnose and resolve this issue:

Check Network Connectivity:

  • Ensure that your machine has a stable internet connection.
  • Try to access the endpoint (such as an API server) directly using curl or wget to verify connectivity.

Proxy Configuration:
If you are behind a proxy, ensure that the proxy settings are correctly configured. Set the http_proxy, https_proxy, and no_proxy environment variables if necessary.
export http_proxy=http://your-proxy:port
export https_proxy=http://your-proxy:port
export no_proxy=localhost,,

Check Firewall Settings:
Ensure that your firewall or security groups are not blocking the requests. This is especially relevant if you're working in a restricted network environment.

Increase Timeouts:
Sometimes the default timeout settings might be too low for your environment. You can increase the timeout settings in Terraform.
provider "aws" {
  version = "~> 3.0"
  region  = "us-west-2"

  # Increase timeouts
  max_retries = 5
  timeout {
    create = "30m"
    delete = "30m"

Check DNS Configuration:
Ensure that your DNS is correctly configured and that your machine can resolve the hostname of the endpoint.

Terraform Provider Issues:
Ensure you are using the latest version of the Terraform provider. Sometimes bugs or issues in older versions can cause connectivity problems.
terraform init -upgrade

Debug Logs:
Enable detailed logging in Terraform to get more information about what might be going wrong.
terraform apply

Verify Provider Configuration:
Double-check your provider configuration to ensure there are no mistakes.
provider "aws" {
  region = "us-west-2"