Why AI services are more sensitive to network conditions
AI services differ from ordinary websites mainly in how they judge a connection. An ordinary site only checks whether the page loads; an AI service also checks which region the request comes from, whether the connection stays up, and whether the same account keeps the same exit. If any one of the three does not line up, you get a blocked sign-in, an answer that stops mid-sentence, or a feature that simply disappears from the interface.
Region checks
Most AI services run a region check at sign-up, at sign-in and at call time, based on where the exit IP is registered. The result is written into the account state, so even after you switch exits, the first result can stick for a while. This is the main reason the same subscription behaves differently on different routes.
Long connections and streaming output
Chat tools return answers token by token, and a single answer can run for tens of seconds. The connection cannot be rebuilt during that time: one stutter on the route and the page freezes halfway through a sentence, and you have to regenerate. Streaming output is far more sensitive to packet loss and jitter than simply loading a page, so whether a route is suitable comes down to whether it can hold up for a whole answer.
Exit IP stability
Signing in to the same account from several regions and several IPs in a short window tends to trigger extra verification. For tools you use over the long term, route stability matters more than peak speed. When choosing a route, check first whether the exit is fixed and whether it drops at peak hours, then look at the latency figure.
Requirements for six kinds of tools
The six groups below cover the situations people ask about most. Each entry covers only what relates to the route, not the tool's own features or pricing.
Chat / streaming
ChatGPT
Web clients are the most sensitive to region and exit consistency; switching exits repeatedly after sign-in tends to trigger re-verification. Answers come back token by token, so a route stutter cuts the generation off.
Long documents
Claude
Region is checked at sign-up and sign-in; uploading long documents is harder on upstream bandwidth. Avoid peak hours when uploading large files, since a dropped connection means uploading again.
Account linkage
Gemini
Tied to the account system: if the sign-in region and the usage region differ, feature entries may be missing. Switching accounts in the same browser causes more trouble than switching routes.
Completion / low latency
Copilot
Completion requests are frequent and small, so latency matters more than bandwidth. Editors usually run their own network stack, and the system proxy does not always apply.
Image generation
Midjourney
Each generation takes a while; if the connection drops, the job keeps queuing server-side and you can collect the result after reconnecting. When going through the chat interface, a stable long connection is also needed.
In-editor calls
Cursor
Indexing and completion fire requests continuously in the background, and connection counts rise sharply with several projects open. The editor needs its own exit configured, not just the browser.
Tools and Routes Compared
The table below lists the main decision points and suggested route types by use case. Route types differ in how they connect: IEPL runs over a dedicated line with a fixed exit, relay forwards through an intermediate node, and direct connects straight into the target region. In practice the difference comes down to whether the exit is fixed and whether the connection holds at peak hours.
| Use case | Main decision point | Suggested route | Notes |
|---|---|---|---|
| ChatGPT web chat | Region check + long streaming connection | IEPL dedicated line | Fixed exit, no switching mid-conversation |
| Claude long documents | Region check + upstream bandwidth | IEPL dedicated line | Uploads use upstream; avoid peak hours |
| Gemini | Account region linkage | Relay | Keep the same region as at sign-in |
| Copilot completion | Latency | Direct | Small payloads, latency first |
| Midjourney | Wait time + long connection | IEPL dedicated line | Keep the connection alive during generation |
| Editors such as Cursor | Concurrent connections | Relay | Background indexing keeps requesting |
| Batch API calls | Fixed exit IP | IEPL dedicated line | Easier allowlisting and retries |
For the specific regions, cities and route type distribution, see the route list.
Sign-up and Sign-in: What to Watch For
Most problems are not about whether you can connect, but about the account being flagged as unusual. The steps below are in the order you should do them.
- Pick a route before signing up, and use the same one for sign-up, verification and first sign-in — do not switch regions in between.
- Keep browser language, time zone and exit region as consistent as you can; when the three contradict each other, checks are more likely to fall through to extra verification.
- Do not sign in from several countries in one day. If you need to compare routes, test them in separate browser profiles.
- After signing in, stay on the same exit for a while so the account state settles before you consider switching.
- When a tool asks for email verification, use an address you will keep long term, and start using the tool in earnest only after verification is done.
Signing up for VPNUJ does not require an email address — a username and password are enough. That is a separate matter from the email verification a tool account may ask for.
Web client vs. API calls
The same tool has two entry points, the web client and the API, and they ask different things of a route.
Web client
The web client touches many domains, mixing static assets, APIs and long connections, and the region check happens at the page level. When the connection drops, the user sees it and can retry manually.
API
The API uses a single fixed domain and authenticates with a key, and failures come back as status codes: 401 is an auth problem, 403 is usually a region or permission mismatch, and 429 is rate limiting. Some platforms record the region of a key's first call and reject calls from elsewhere afterwards.
Use the same exit for the web client and the API. When something breaks, confirm in the browser whether the feature works, then go back and debug the API side — that saves a round of guessing.
Configuration notes for developer setups
Command line
Command-line tools read proxy settings from environment variables, not from system settings. If you only configure the browser, the terminal still connects directly, which shows up as pages loading while commands time out. Point the terminal at an exit separately.
export HTTPS_PROXY=http://127.0.0.1:7890
export HTTP_PROXY=http://127.0.0.1:7890Fill in the port that your local client actually listens on. The example above only shows the variable names and format.
IDE plugins
Editors and plugins usually ignore the system proxy and need it set in the plugin's own settings. Cursor and Copilot fire a burst of indexing requests when a project opens and connection counts climb sharply, so a route's concurrency matters more than single-request speed.
CI and build machines
Build machines usually have a fixed exit. Adding that exit to the API platform's allowlist is less work than editing config each time; if the exit changes, give CI a dedicated fixed route so it does not compete with day-to-day use.
Common failure symptoms and causes
The six symptoms below come up most often; match the symptom and work through the cause.
The answer stops mid-sentence and has to be regenerated after a refresh
The streaming connection was interrupted, usually by route jitter or by the machine switching between Wi-Fi and cellular. Move to a route with steadier latency and avoid changing networks while an answer is being generated.
A message saying the region is not supported
The exit IP is registered in a different region from the one recorded on the account. Fix one route first, then sign in again; do not retry across regions in a row, since more retries make verification harder to pass.
Verification is requested again and again after sign-in
The exit changed too often in a short window, or old session data is still in the browser. Clear the site data once, sign in again on a fixed route, and stay on that exit afterwards.
Image or file upload fails
Upstream bandwidth is short, or the connection was reset mid-transfer. Move to a route with more generous upstream and keep large files out of peak hours.
API returns 403 or 429
403 is usually a region or key/exit mismatch — go back to the original exit; 429 is rate limiting, so lower concurrency and add backoff retries.
The page loads but feature entries are missing
Some features are opened up by region, so a page that loads does not mean the feature works. Judge a route by whether the feature appears, not by whether the page opens.
Route recommendations
Once you separate the use cases, choosing a route comes down to two questions: is the exit fixed, and can the connection hold up for a whole task. Latency comes third.
By use case
- Day-to-day chat: a stable dedicated line is enough; there is no need to chase the lowest latency.
- Long documents and image generation: upstream bandwidth and how long the connection holds matter more, so prefer a dedicated line.
- Code completion: latency first — pick a closer relay.
- Batch API: a fixed exit first, for easier allowlisting and debugging.
By plan
- Monthly ¥9.9 with 60GB: enough when text chat is the main use.
- Monthly ¥18 with 250GB: several devices, long documents and image uploads at the same time.
- Monthly ¥28 with 500GB: image generation and batch calls running in parallel.
- Data packs ¥158/300GB, ¥358/1000GB, ¥658/3000GB: use them until they run out, they never expire — suited to irregular usage.
Traffic resets monthly on the activation date, and when you upgrade mid-cycle the difference is prorated over the remaining days. No limit on simultaneous devices, 14-day money-back guarantee, payment by Alipay / WeChat / USDT.
Next steps
For the full route list and city coverage see the route list; for prices and billing periods see plan pricing; for subscription import steps see the setup guide; for a more systematic troubleshooting order see the AI acceleration handbook.