João Victor Ramires Guimarães Brito jramiresbrito

Permanent WSL DNS Fix (WSL 2.2.1+)

If you're encountering ping github.com failing inside WSL with a Temporary failure in name resolution, you're not alone — this has been a long-standing issue, especially when using VPNs or corporate networks.

This issue is now fixed robustly with DNS tunneling, which preserves dynamic DNS behavior and avoids limitations like WSL’s former hard cap of 3 DNS servers in /etc/resolv.conf.

DNS tunneling is enabled by default in WSL version 2.2.1 and later, meaning that if you're still seeing DNS resolution issues, the first and most effective fix is simply to upgrade WSL. Upgrading WSL updates the WSL platform itself, but does not affect your installed Linux distributions, apps, or files.

To upgrade WSL, follow these steps,

dev bit of Gemfile

group :development, :test do
  gem "rspec-rails"
  gem 'capybara'
  gem 'factory_girl_rails'
  gem 'forgery'
  gem "database_cleaner"
  gem "mongoid-rspec"

	-- show running queries (9.2)
	SELECT pid, age(clock_timestamp(), query_start), usename, query
	FROM pg_stat_activity
	WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%'
	ORDER BY query_start desc;

	-- show long-running queries (greater than 5 minutes)
	SELECT
	pid,
	now() - pg_stat_activity.query_start AS duration,