When choosing a VPN for Cursor or Copilot, focus on whether real coding tasks run through to completion. Fast downloads don’t guarantee reliable completions, and opening a website in your browser doesn’t mean your editor uses the same route. Prioritize a working exit, uninterrupted responses, and easy failover—then compare price and data allowance.
What kind of connection do AI coding tools need?
Code completions, chats, and agent tasks don’t all use the network in the same way. Completions often involve frequent short requests, while chats and longer generation tasks usually need a response stream that stays open. Tools may use different transport methods, so not every feature should be treated as one permanent connection.
A brief outage, connection reset, or timeout during a long response can make output stall, trigger a retry, or fail the task altogether. Agent tasks may also call multiple endpoints. If one request takes the wrong route, you may find that chat works but execution fails.
For development, response continuity matters more than peak speed in a single test. A slow first response may be caused by connection setup, routing, or service-side queues. If output starts and then stops, check for packet loss, timeouts, route changes, and server errors. Network conditions aren’t the only factor: model load, account permissions, and workspace settings can affect results too.
| What to observe | How to check | What you can’t conclude |
|---|---|---|
| First response | Note how long it takes for the first output to appear after submitting a task | A long wait doesn’t necessarily mean the route is slow; the service may be busy |
| Continuous output | Check whether long responses pause, return errors, or ask you to retry | A successful short completion doesn’t prove that longer tasks are reliable |
| Jitter and packet loss | Check client diagnostics and the times when tasks fail | One low-latency result doesn’t represent the entire time you’re using the service |
| Exit consistency | Check editor logs, proxy match records, and the exit region | A browser using the expected exit doesn’t mean every process does |
| Recovery | Check whether requests can resume after the network recovers | A connected status in the client doesn’t mean the task has recovered |
How to compare direct, relayed, and IEPL routes
Here, “direct” means the proxy client connects to the proxy server mainly over the public internet—not that you’ve disabled the proxy and are connecting straight to the destination service. The route may be simpler, but the experience depends on your local ISP and international routing. A shorter geographic distance doesn’t necessarily mean a shorter network path or better reliability in the evening.
A relay adds a forwarding step between you and the exit. A well-chosen relay may avoid a poor public-internet route, but congestion at the entry point or limited forwarding capacity can also add variability. An extra step isn’t automatically better; what matters is how the full route performs when you actually use it.
IEPL refers to a dedicated Ethernet transmission service. In a subscription service, an “IEPL route” usually describes one segment of the connection; it doesn’t mean the entire path from your editor to the AI service uses a dedicated link. The connection from the exit to the destination may still use the public internet, and the platform’s own access policies still apply.
Let the problem determine what to try: if a direct route completes tasks reliably, keep using it. If your local network is fine but the connection repeatedly fluctuates at certain times, compare relayed and dedicated routes. Don’t assume a route name guarantees lower latency, a cleaner exit, or access to a service.
Why does my browser work while my editor fails?
System proxy settings may not cover every process
A browser may follow the system proxy, while an editor extension, separate background process, or integrated terminal may use different network settings. Even when tools run on the same computer, don’t assume they share proxy settings. Check the official network documentation for your version, then verify the editor’s proxy options and the client’s listening address.
With a local HTTP proxy, the address and port in your editor must match the endpoint provided by the client. Don’t enter a subscription link as the proxy address. Whether environment variables take effect depends on how the process starts and which networking library it uses. Restart the relevant processes after making changes so they don’t keep using the old settings.
Remote development: identify where requests originate
When you work over SSH, in a container, or in a remote development environment, some extensions run remotely. If a request originates on the remote machine, your local system proxy usually won’t cover it automatically. In a remote configuration, localhost refers to the remote machine itself, not your local client. First identify where the request originates, then use a proxy endpoint that environment can reach and that you’re authorized to use.
Split-tunneling rules may miss relevant domains
The sign-in page, completion API, chat service, and resource downloads may use different domains. A proxy rule for just the main website can miss the actual API requests. Use rules that are compatible with your client, from a trusted source, and actively maintained; check the match records rather than masking the underlying issue with increasingly broad rules.
TUN mode can take over traffic at a lower network layer, but routing, DNS, and exclusion rules still apply. It isn’t a switch that fixes every problem automatically. Windows, macOS, and Linux differ in permissions and virtual networking, so follow the documentation for your client and avoid running multiple tools that compete to take over network traffic.
Import and verify your subscription
Before getting a subscription, check that your client supports its format and the protocols in its configurations. A subscription distributes connection settings; it isn’t an editor account credential or a local proxy address. Treat the subscription link as sensitive information and don’t post it in a public code repository or issue tracker.
- Get the client and subscription. VPN73’s client download is available from the user panel after you sign in. Choose a client for your operating system and import the subscription as directed in the panel. Don’t download installers from unknown sources.
- Check the import. Make sure the route list has updated and that there are no format errors or unsupported-protocol warnings. Choose a candidate exit, connect in the client, then configure the proxy method used by your editor.
- Verify the exit and rules. Use an IP lookup to check your browser’s exit, then check editor diagnostics or the client’s connection records to confirm that developer-tool requests use the expected route. Verify each separately.
- Run real development tasks. In a test workspace with no sensitive code, try a completion, a chat, and a longer generation task. Check that the full response comes back and that you can identify the specific request when an error occurs.
- Keep a minimal configuration record. Note the client version, traffic-capture method, exit name, and active rules. Make other changes only after you have a stable setup, so you can trace what changed if something goes wrong.
How to compare persistent connections reproducibly
Keep the editor version, model, test task, and workspace fixed, and make each request’s input roughly the same size. Test candidate routes one at a time on the same network, changing only the route. Before switching exits, stop any running task and submit a new request after the switch; existing connections may not move to the new exit.
Choose a task that produces a sustained response, such as asking the tool to explain how test project modules relate and then generate a corresponding test. Record whether the first output appears promptly, pauses along the way, completes in full, and includes any error messages. Don’t reduce the result to “fast” or “slow,” and don’t treat one successful run as proof of long-term reliability.
Repeat the checks during your usual working hours and keep records of failures. If the destination service is having an outage, mark that separately instead of attributing every failure to the route. Results apply only to the network and time period you recorded; they can’t be turned into a speed guarantee for every region or user.
- ✅ Test candidate routes with the same tasks; evaluate completions and long responses separately.
- ✅ Record error types and circumstances, and check account permissions and service status.
- ✅ Keep separate records of proxy matches in local and remote environments.
- ❌ Don’t treat download speed tests, one-off latency results, or route labels as a definitive ranking.
- ❌ Don’t repeatedly change your account region for testing or try to get around platform access policies.
Troubleshooting Boundaries for Disconnections, DNS, and Account Issues: Diagnosis
DNS problems can show up as failed domain lookups, requests resolving to an unsuitable address, or DNS queries not following the expected network policy. Remote DNS through the client, system DNS, and encrypted DNS in the browser may all be active at once. Check the actual DNS settings and rules instead of switching to a public resolver at the first sign of trouble.
A DNS leak generally means that DNS requests aren’t being sent over the protected route as expected. That’s a separate check from whether application traffic is going through the proxy. A browser test also can’t prove that the editor’s background processes use the same DNS method; check the request records for those processes too.
If several international websites fail at once, first check your local network, client, and subscription status. If only the editor fails, check extension logs, proxy settings, and rules. If you can connect but see an account permission, region, or usage-limit error, follow the destination platform’s guidance. A VPN doesn’t grant access to Cursor or Copilot or replace their account subscriptions.
VPN73 is one subscription service you can evaluate, but verify that it works for your tasks. Monthly plans are ¥9.9 / 60GB, ¥18 / 250GB, and ¥28 / 500GB, billed monthly with data resetting each month on your activation date. If you use it occasionally, you can also consider data packages that never expire. See the plans page for current pricing. Code repositories, dependency downloads, and container images may use more data than text chats, so check which traffic your split-tunneling rules cover before choosing a plan.