Describe the bug
Recently I noticed that the Electron applications I commonly used ceased to be able to connect to the internet. Spotify, Discord, Slack cannot connect anymore.

To Reproduce
Steps to reproduce the behavior:

1. Use latest nixpkgs channel
2. Install Slack, Spotify or Discord
3. They cannot connect to their respective servers

Expected behavior
They should be able to connect to the internet.

Metadata

• system: "x86_64-linux"
• host os: Linux 5.7.10, NixOS, 20.09pre236091.28fce082c8c (Nightingale)
• multi-user?: yes
• sandbox: yes
• version: nix-env (Nix) 2.3.7
• channels(root): "nixos-20.09pre236091.28fce082c8c"
• nixpkgs: /nix/var/nix/profiles/per-user/root/channels/nixos