Why does Google Antigravity fail with standard TUN mode VPNs?

Virtual TUN network adapters capture all operating system packets indiscriminately. Under heavy network traffic or state ISP Deep Packet Inspection (DPI), long-lived HTTP/2 gRPC streaming connections between Antigravity and Google DeepMind servers suffer TCP RST packets, causing stream dropouts and authentication token invalidation.

What are the standard local SOCKS5 proxy ports for V2Ray, Clash, and NekoBox?

The default loopback ports are: 10808 for V2RayN and Xray core, 7890 for Clash and Mihomo, 2080 for NekoBox, and 1080 for generic Shadowsocks clients.

How does Antigravity Cleaner automate proxy launching?

Antigravity Cleaner inspects active local listening ports using netstat/ss, selects your operational proxy daemon (e.g., 127.0.0.1:10808), injects Chromium proxy flags (--proxy-server=socks5://127.0.0.1:port) into the binary arguments, and creates an isolated desktop launcher.

How to Configure V2Ray, Clash & SOCKS5 Proxy for Google Antigravity (Without TUN Mode)

A senior DevOps breakdown of Electron process proxy injection, loopback socket isolation, and eliminating gRPC stream drops during autonomous agent generation.

When software developers in restricted regions (such as Iran, Russia, and China) attempt to run Google Antigravity through standard VPN clients, they quickly face severe connection stability issues. Long-running AI coding sessions frequently stall with stream resets, and attempting to log in triggers the infamous:

                HTTP 403 Forbidden: "Your current account is not eligible for Antigravity, because it is not currently available in your location."
            

The instinctive reaction is to turn on System-Wide TUN Mode in clients like V2RayN, Clash Verge, or NekoBox. In this guide, we examine why TUN mode is fundamentally flawed for Google Antigravity, and demonstrate the robust alternative: Targeted Loopback SOCKS5 Proxy Injection.

1. Why System-Wide TUN Mode Fails for AI IDEs

Virtual TUN adapters (like WinTun or Linux tun0) operate at Layer 3 (Network Layer). While convenient for general web browsing, they introduce major architectural hazards for developer environments:

Local ISP Deep Packet Inspection (DPI): TUN adapters route all device traffic through the encrypted tunnel. High traffic spikes trigger ISP middleboxes to inject TCP RST packets into continuous HTTP/2 multiplexed streams, abruptly severing code generation midway.
DNS Leakage & Dual-Stack Conflicts: Windows and macOS often resolve Google API hostnames through domestic physical NIC DNS resolvers before the TUN interface captures them. Google's Edge CDN instantly tags the request from an unsupported territory.
Domestic Traffic Slowdown: Local package managers (npm, pip, cargo, docker) and internal dev databases (Postgres, Redis) get routed through international proxy hops, drastically degrading development speed.

Key Architectural Insight: Google Antigravity is built on the Electron framework (Chromium runtime + Node.js worker threads + native Go daemons). The most reliable way to route it is at the Process Layer (Layer 7), leaving the rest of your operating system on direct, high-speed local networking.

2. Standard Local SOCKS5 Proxy Ports

Most modern anti-censorship daemons run a local loopback proxy listener on 127.0.0.1. Here is the reference table of standard client ports:

Proxy Client / Core	Default Protocol	Default Port	Loopback URL
V2RayN / Xray Core	SOCKS5	`10808`	`socks5://127.0.0.1:10808`
Clash / Clash Verge / Mihomo	Mixed (HTTP/SOCKS5)	`7890`	`socks5://127.0.0.1:7890`
NekoBox / NekoRay	SOCKS5	`2080`	`socks5://127.0.0.1:2080`
Shadowsocks / Outline	SOCKS5	`1080`	`socks5://127.0.0.1:1080`

3. Manual Process Proxy Injection (Under the Hood)

To launch Google Antigravity through your loopback proxy without touching global OS network routes, supply Chromium command-line flags directly to the executable:

On Linux:

                # Launch Antigravity through active V2Ray SOCKS5 port (10808)

                antigravity \
                  --proxy-server="socks5://127.0.0.1:10808" \
                  --host-resolver-rules="MAP * ~NOTFOUND , EXCLUDE 127.0.0.1" \
                  --no-sandbox
            

On Windows (PowerShell):

                # Set environment variables for Node.js worker subprocesses

                $env:HTTP_PROXY = "http://127.0.0.1:10809"

                $env:HTTPS_PROXY = "http://127.0.0.1:10809"

                $env:ALL_PROXY = "socks5://127.0.0.1:10808"

                # Launch Antigravity binary with Chromium proxy argument

                & "$env:LOCALAPPDATA\Programs\Antigravity\Antigravity.exe" --proxy-server="socks5://127.0.0.1:10808"

4. The 1-Click Automated Solution: Antigravity Cleaner

Manually managing terminal flags every time you launch the IDE is tedious and error-prone. Antigravity Cleaner automates this workflow end-to-end:

Automatic Port Probe: Scans active loopback sockets to detect whether V2Ray (10808), Clash (7890), or NekoBox (2080) is running.
Core Patcher: Neutralizes client-side regional checks in main.js, agy, and extension.js so Google account sessions never get invalidated.
Desktop Launcher Creation: Generates a permanent desktop shortcut and application menu launcher with embedded proxy arguments.

                # Step 1: Install Antigravity Cleaner (Linux / macOS)

                curl -sSL https://raw.githubusercontent.com/tawroot/antigravity-cleaner/main/install.sh | bash

                # Step 2: Auto-detect proxy and launch

                ag-cleaner launch

Windows PowerShell equivalent:

                irm https://raw.githubusercontent.com/tawroot/antigravity-cleaner/main/install.ps1 | iex

                ag-cleaner launch

5. Preventing Middlebox Disconnects (TCP KeepAlive)

During extensive reasoning or refactoring tasks, Google DeepMind's LLM generation stream may remain idle between chunks for 10 to 30 seconds. State firewall middleboxes often drop idle TCP sessions.

Antigravity Cleaner incorporates an active 15-second TCP KeepAlive heartbeat on the injected proxy tunnel. This ensures middlebox firewalls never time out long-running code generation queries.

6. Troubleshooting Matrix

Observed Symptom	Underlying Root Cause	Permanent Resolution
`HTTP 403 Forbidden / Account Not Eligible`	Geo-IP check failed due to direct egress or DNS leak	Run `ag-cleaner patch` and launch via `ag-cleaner launch`
`SingletonLock: Lock could not be acquired`	Previous IDE instance crashed and orphaned socket lock	Run `ag-cleaner clean` to remove stale locks safely
`HTTP 429 Quota Exceeded (RESOURCE_EXHAUSTED)`	Shared IP address exhausted rate limits across users	Switch proxy server node or cycle proxy connection in V2Ray
`Code generation stream aborts after ~30s`	Middlebox DPI reset idle TCP connection	Launch via `ag-cleaner launch` (enables 15s TCP KeepAlive)