01 / How the checks work
Why a route affects AI tools
AI tools differ from ordinary web pages because three things happen at once: the request has to pass a region check, the connection has to stay open for a long time, and the answer is pushed out as it is generated. When any one of these breaks, it looks like a slow network, but the causes are completely different.
Region checks look at where the exit IP is registered. Most tools use this to decide which features, model versions and interface languages you get. When the IP location and the account region disagree for a long time, features come and go: a model you can switch to today may be only partly available tomorrow.
IP reputation checks look at the type of exit IP and how many people share it. When one block of data-centre IPs is shared by a large number of accounts, sign-up and login are more likely to trigger a human check; residential and home broadband ranges are usually smoother. This is also why the same route browses the web without a problem but gets blocked when you log in to an AI tool.
Long-lived connections and streaming output depend on link jitter. The answer is pushed in chunks over a connection that stays open for a long time; if one packet is dropped along the way, the front end stops mid-sentence, and after a refresh you usually have to ask again from the start. Bandwidth has little to do with this: a route with plenty of bandwidth but high jitter will still drop.
So the order for picking a route is: first confirm where the exit IP is registered and what type it is, then look at jitter, and only then look at bandwidth. Doing it the other way round and comparing bandwidth first usually does not fix blocked logins or interrupted answers.
02 / What each tool needs
What each of the six tools needs from the network
The six tools sit in different usage patterns: chat, search, code completion, image generation and inline generation inside an IDE. The pattern decides how long and how dense the requests are, and therefore which route suits them.
ChatGPT
All three paths are in use: web chat, file upload and API. Region checks are strict, and the login step is the most sensitive to human verification. A fixed exit IP with a stable registered location comes first.
DedicatedClaude
Answers are long and connections stay open for a long time, and asking follow-up questions after uploading a document is common. One burst of jitter and the whole answer stops mid-sentence, which is the most expensive thing to redo.
DedicatedGemini
Search-style Q&A and multimodal input: the first screen is heavy on resources and the page fires many concurrent requests. Bandwidth and concurrent connection count matter more than single-request latency.
RelayCopilot
Inline completion inside the IDE: requests are short and dense, and many are sent over a day. Low single-request latency matters more than high bandwidth, and jitter shows up directly as completions that never appear.
RelayMidjourney
Image generation: you submit a job and wait for the result. Uploading reference images and downloading finished work both put demands on upload and download, and a narrow uplink is where this step fails most often.
RelayCursor
Inline generation and repository indexing inside the IDE: requests are long and concurrency is high, and the indexing phase occupies the link continuously. A fixed exit reduces drop-outs in the middle of generation.
Dedicated03 / Account steps
What to watch during sign-up and login
Sign-up and login are the part of the chain most likely to get stuck, because this step involves region checks, human verification and account status all at once.
Region consistency: keep the registered location of the exit IP, the interface language and the payment region as consistent as you can. When the three contradict each other, later logins are more likely to ask for a second verification.
Human verification: repeated prompts are usually not a problem with the account itself but with an exit IP block shared by too many people. Switching to an independent exit and leaving it alone for a while works better than retrying.
Do not keep switching routes during sign-up: registering from region A, verifying from region B and logging in from region C is the sequence most likely to be flagged as unusual.
After logging in, use the account steadily for a while: once you have confirmed that features work and models can be switched, adjust the route as needed. Changing the exit right after login resets the stable state you just built.
VPNDH needs no email address: a username and password are enough. Once the subscription is active, the client and subscription details are in the user panel.
04 / Connection types
The three ways to connect
With the same tool, the web app, the API and developer tooling can behave completely differently. Troubleshooting by connection type is more useful than saying it will not connect.
01
Web app
- The answer is pushed out as it is generated, so switching routes mid-answer is an active disconnect and the page stops mid-sentence.
- The first screen loads many resources and fires many concurrent requests, so both bandwidth and connection count need to be sufficient; a route with low latency but narrow bandwidth is actually slower on first load.
- When uploading images, PDFs or archives, upload bandwidth decides how long you wait.
- Recommendation: a dedicated line with a fixed exit, first choice at peak hours.
02
API calls
- API endpoints are not always the same as the web domain. Test connectivity against the address given in the tool documentation; do not infer that the API works because the web page opens.
- Streaming responses come back in chunks over a long-lived connection and are sensitive to jitter; set a retry limit and backoff so that repeated submissions do not create extra charges.
- Where a fixed exit is needed for an allowlist, settle the route when the account is set up.
- The example endpoint is for format reference only:
https://example.com/v1/chat.
03
Developer tooling
- IDE plugins and command-line tools send requests continuously in the background: many connections, short individual requests, sensitive to latency and insensitive to bandwidth.
- CI environments go through a proxy via environment variables; the example values are for format reference only:
export HTTPS_PROXY=http://example.com:8080
export HTTP_PROXY=http://example.com:8080- Repository indexing and model downloads are long jobs; run them outside peak hours, or give them a separate route with more bandwidth.
- Recommendation: the development machine on a dedicated line, CI on a relay, so the two paths are separate and easier to diagnose.
05 / Comparison table
Tool × route table
The table below gives recommendations by usage pattern; it is not a guarantee of availability. Real performance depends on your local network, the time of day and the checks on the tool side.
| Tool | Main use | Key requirement | Suggested route |
|---|---|---|---|
| ChatGPT | Web chat · File upload · API | Stable exit location; login is sensitive to risk checks | Dedicated |
| Claude | Long-form chat · Document upload | Long-lived connections; low jitter | Dedicated |
| Gemini | Search-style Q&A · Multimodal | Heavy first-screen resources; many concurrent connections | Relay |
| Copilot | IDE code completion | Short, dense requests; latency first | Relay |
| Midjourney | Image generation · Reference image upload | Both upload and download bandwidth need to be sufficient | Relay |
| Cursor | Inline generation · Repository indexing | Long requests, high concurrency, fixed exit | Dedicated |
The route types in the table are a suggested range; the total number of routes is the 150+ listed on the routes page, and this table only covers the common patterns of six tools.
Dedicated
An independent link with a fixed exit that avoids congested nodes, suited to long-lived connections and the login step. First choice for ChatGPT, Claude and Cursor.
Relay
Access through relay nodes, covering more regions, suited to first-screen resource loading and image generation, and useful as a load-sharing route alongside a dedicated line.
Direct
A direct connection with the shortest path, suited to cases where the local network is already good and only a little cross-border access is needed; the exit location is less stable than a dedicated line.
06 / Troubleshooting
Common failure symptoms and causes
The same message can come from completely different causes. Locate the symptom to a stage of the chain first, then decide whether to change route or change time of day.
The page spins forever and finally reports a network error
Usually jitter on the exit route or a local DNS failure. Switch to another route in the same region and retry, then check the local DNS settings; if both are ruled out, check whether the tool is under maintenance.
The page opens but says the service is not available in your region
The registered location of the exit IP does not match the account region, or the IP block is classified as a data-centre range. Switch to a route with a fixed exit and leave it unchanged for a while after logging in.
The answer stops halfway and you have to ask again after refreshing
The long-lived connection for streaming output was interrupted. Bandwidth has little to do with this; switch to a lower-jitter route first. If it only happens at peak hours, moving the main route to a dedicated line is the more direct fix.
Login keeps asking for human verification
The same exit IP is shared by too many accounts. Switching to an independent exit and leaving it alone for a while works better than retrying, and retrying itself makes the check stricter.
Uploading an image or document fails
Not enough upload bandwidth, or an MTU mismatch on the link dropping large packets. Switch to a route with more upload capacity, or upload outside peak hours.
The API returns 429 or the request times out
429 is usually a request-rate limit, so lower concurrency and add backoff first; a timeout is usually link jitter or a rate-limited exit, and switching routes and testing again tells the two apart.
07 / Wrapping up
The order for picking a route by use case
The judgements above come down to a sequence you can follow; four steps cover most situations.
Start with the route type by use case
Long-lived connections and the login step go on a dedicated line; first-screen resources and image generation go on a relay; use direct connections where the local network is already good. For the same tool, try one of each first, then decide which one is primary.
Then adjust by time of day
At peak hours prefer a dedicated line with a fixed exit; during the day let a relay share the load. The pairing of time of day and route type is more stable than asking which route is fastest, and easier to reproduce.
Keep a backup route ready
Keep two routes in different regions for the same tool and switch directly when one fails; do not retry on the same route over and over, because retries make risk checks stricter too.
Use the refund window to test
The 60-day money-back guarantee is long enough to cover a full peak-hour cycle. Test first and then decide whether to stay long term; that is more direct than reading any review.
Coverage and devices: 110+ countries / 150+ routes, unlimited devices on one subscription, usable on Windows, macOS, iOS, Android and Linux.
Pricing: monthly plans are ¥9.9/month for 60GB, ¥18/month for 250GB and ¥28/month for 500GB, with traffic reset monthly on the activation date and mid-term upgrades prorated into remaining days; data packs are ¥158/300GB, ¥358/1000GB and ¥658/3000GB, used until they run out and never expiring.
Payment and sign-up: Alipay / WeChat / USDT; no email address needed, a username and password are enough.
The full list of regions and routes is on the routes page, and pricing tiers and data packs are on plans.