First, distinguish between a failed subscription download, content that downloads but won’t parse, and nodes that import but won’t connect. This guide is for v2rayN and v2rayNG users who encounter subscription update errors. Check the URL, network route, response content, and format—in that order. Keep any working nodes, and change one thing at a time so you can tell what fixed the update.
Identify where the update fails before reinstalling
A subscription URL is how you retrieve node configurations; it is not a node itself. The client requests the URL, converts the response into node entries, then passes those entries to the core to establish connections. If either of the first two steps fails, troubleshoot subscription retrieval or parsing. Only investigate node connectivity if the final step fails. A “Service started” status means only that the local service is running—it doesn’t confirm that the subscription server or remote nodes are reachable.
| What you see | Check first | No need to change yet |
|---|---|---|
| Times out after waiting; no content received | DNS resolution, direct or proxy route, and server availability | Node transport settings |
| Returns 401, 403, or 404 | Access token, subscription URL, and server-side restrictions | Local listening port |
| Content received, but parsing fails; 0 nodes added | Whether the response contains node configurations and uses a supported format | System proxy setting |
| Update succeeds and nodes appear, but websites won’t load | Node connection, system proxy, routing, and DNS | Repeatedly reimporting the subscription |
Note the time of the update, the group name, and the first error in the log. A later “no usable configuration” message may simply result from an earlier download failure. Error wording varies between versions, so focus on the stage that failed rather than searching for one exact message.
Check the subscription URL, account status, and response body
Start on the subscription provider’s account page. Check that your plan is active, you haven’t run out of data, and the subscription URL hasn’t changed. Being able to sign in doesn’t mean your subscription is still authorized. If you reset the subscription token, the old URL saved in the client may stop working immediately. Renewing your plan without replacing the old URL may not fix the issue.
-
Verify the URL
On the provider’s site, choose a subscription URL intended for v2rayN or v2rayNG. Don’t copy the account login page, purchase page, or QR code image URL. A link for sharing a single node is not a subscription URL.
-
Copy it again
Use the page’s copy button to replace the old URL in the client. Check that it starts with
https://and has no trailing spaces, line breaks, or punctuation. Keep all query parameters intact; don’t shorten the URL. -
Check authorization
Check whether the subscription was reset, paused, or access-restricted. For a 401 or 403, verify the token and the provider’s access rules. Don’t keep clicking Update in quick succession.
-
Check the response body
If you inspect the response in a trusted local environment, confirm it contains configuration text—not a login page, access verification page, or expiry notice. A page opening in your browser proves only that you received a response, not that the client can parse it.
An HTTP 200 response can still contain an error page. Some services return “subscription expired” as plain text or redirect to a page that requires login. The client may still try to parse that content, resulting in a format error. Switching cores repeatedly won’t help; first restore a valid response from the subscription service.
Change the update route in the client to avoid a proxy dependency loop
Subscription updates can use a direct connection or an existing proxy. If the subscription domain is unreachable directly, try updating through a proxy. But if that proxy node is already down, the update will fail too—a loop where you need a new node to retrieve new nodes. Keep at least one confirmed working configuration while testing; don’t clear the group first.
v2rayN: Test one group first
-
Check the group URL
In the main window, open “Subscription group” → “Subscription group settings,” edit the target group, verify its URL, and save. Menu names may vary slightly by version. Look for the edit window where the group’s URL is stored.
-
Try a direct update first
From the “Subscription group” menu, select “Update current subscription (without proxy).” Test only the target group to keep logs from other failed subscriptions out of the way. If your version only offers an update-all option, identify the result by group name.
-
Then try updating through a proxy
If the direct update fails, select a confirmed working node, then choose “Update current subscription (through proxy).” If all existing nodes are down, get a valid single-node configuration from the provider or switch to a network that can reach the subscription service.
-
Compare the errors
Record both results. If a direct update times out but a proxy update succeeds, the two routes have different levels of reachability. If both return the same 403, focus on authorization, access restrictions, and the server response.
v2rayNG: Test stopped and connected states separately
Open “Subscription group settings” from the side menu, edit the target group, save its URL, then return to the main screen. Open the menu in the upper-right corner and select “Update subscription.” If your version offers both “without proxy” and “through proxy,” test each. If there’s only one update option, use the logs to confirm the actual route; the connection button’s status alone isn’t proof.
- Stopped: Stop the connection, then update once to see what happens without the current tunnel.
- Connected: Select a confirmed working node, connect, then update. Whether the request actually uses the proxy also depends on app behavior, routing, and per-app proxy settings.
- Compare networks: If the same URL fails on Wi-Fi but works on mobile data, check DNS resolution or access policies on the current network before changing the subscription content.
Bottom line: Find a route that retrieves the response
If either update route returns valid nodes, keep using it and complete the update. There’s no need to change routing, DNS, and the core at the same time. Too many simultaneous changes can make a reachability problem look like a format issue.
Use the exact error to distinguish network, authorization, and parsing issues
The following are examples of errors that may appear in network or parsing logs; wording varies by version. Read them alongside the URL domain, status code, and stage where the error occurred. A failure to connect to the subscription server is not the same as a failure to connect to a proxy node.
Error: 401 Unauthorized
Cause and fix: The server didn’t accept the authorization details in the request. Copy a valid subscription URL from your account page and make sure the token hasn’t been reset. Don’t add your website login password to the URL.
Error: 403 Forbidden
Cause and fix: The server denied access, possibly because of account status, source restrictions, or an access check. Review the provider’s instructions, then compare direct and proxy results. A 403 by itself doesn’t prove that the subscription has expired.
Error: 404 Not Found
Cause and fix: The requested path doesn’t exist, or the server uses this status to hide an invalid URL. Check that you copied the full URL and that the subscription endpoint hasn’t moved. Get the URL again from your account page; don’t guess the API path.
Error: 429 Too Many Requests
Cause and fix: You’ve hit a rate limit. Stop updating repeatedly and wait as instructed by the server. If the response includes Retry-After, wait for the specified time. Also check whether multiple devices are refreshing automatically.
Error: Connection refused
Cause and fix: The destination port refused the connection. First check whether the log points to a local proxy or the subscription server. For a local loopback address, make sure the client service is running and that the update request uses the port the client is currently listening on.
Error: Invalid length for a Base-64 char array or string.
Cause and fix: In some parsing environments, this means the content couldn’t be decoded as expected using Base64. First make sure the response isn’t a webpage, error message, or truncated text. Then get a subscription format supported by your client. Don’t add characters at random.
For example, if the error points to 127.0.0.1:10808, check the local proxy listener first. If it points to port 443 on the subscription domain, check the remote HTTPS request. Port 10808 is just an example; installations may use a different port. Use the local listening port shown in your client.
- DNS resolution failed: First confirm the device is online, then check whether the subscription domain resolves. Replacing the domain with an IP address can break HTTPS certificate matching and isn’t a standard fix.
- Certificate error: Check the device’s date, time, and time zone, and whether the network requires you to sign in through a captive portal first. Don’t disable certificate validation to hide the problem.
- Request timed out: Compare the results over a direct connection, a proxy, and another network. Increasing the timeout won’t fix a wrong URL or an unreachable route.
Download succeeds but parsing fails: check the format and supported parameters
A subscription is a way to distribute configurations, not a protocol with one fixed format. The response might contain an encoded list of share links or another structured format supported by the client. Neither the file extension nor the button label proves compatibility. Prefer an output that the provider explicitly identifies as compatible with your client.
| Response content | How to identify it | What to do |
|---|---|---|
| HTML page | Contains <html, a login prompt, or an access check | Check the URL, authorization, and redirect destination to retrieve the actual subscription response |
| List of share links | After decoding, look for prefixes such as vmess:// or vless:// | Make sure the links aren’t truncated, and check which protocols and parameters the client supports |
| Configuration for another tool | The response structure doesn’t match the current client’s import requirements | Select a compatible output on the provider’s site; changing the file extension isn’t enough |
| Empty response or expiry notice | No configuration—only account status or a text notice | Restore subscription access or ask the provider to fix the output |
VMess and VLESS are protocols; REALITY is a connection security mechanism. They aren’t interchangeable subscription formats. v2rayN is a desktop client that parses and manages configurations, then calls a core. v2rayNG uses the Xray core, while v2flyNG uses the v2fly core. A parameter works only if the client can import it and the core can run it—don’t judge compatibility by the node name alone.
- None of the nodes import: Check the overall response format and authorization page first; don’t edit nodes one by one.
- Only some nodes are missing: Check whether the relevant protocol, transport, or new parameters are supported. Review the release notes to see whether you need to update the client.
- Imported nodes won’t start: Check the core logs for configuration errors. Successfully parsing a share link doesn’t mean the current core accepts every generated parameter.
- The same subscription only fails in an older client: Back up your settings, download a client version compatible with your operating system from the site, and test again. Don’t invent parameter values or remove unfamiliar fields to force an import.
Bottom line: Use a single-node configuration to separate format issues from node issues
If the provider offers a share link for an individual node, import it separately while keeping the original group. If the individual link works but the full subscription fails, focus on the subscription output and group import process. If both fail, check whether the node’s parameters are supported.
Verify that updates work before cleaning up old configurations
After seeing “Update succeeded,” confirm that nodes appear in the target group, then try connecting to one. A successful update only means the content was retrieved and imported; it doesn’t guarantee that every node from the provider will connect. A latency test doesn’t prove that websites will load, either—check that your usual apps work.
-
Confirm the import
Check the group name, node list, and last-updated time. Zero new nodes could mean nothing changed or that the response was empty; compare the logs with the existing list.
-
Test the connection
Select a node and start the service. On desktop, if you want your browser to follow the system proxy, open “System proxy” in v2rayN, select “Automatically configure system proxy,” and test a familiar HTTPS site.
-
Keep a record of the fix
Note whether the successful update used a direct or proxy route, which network you were on, and whether you changed the subscription URL. Once the new configuration works, you can remove duplicate groups or old URLs without losing a fallback option.
Still failing? Include these details when asking for help
- Client name, version shown in the client, and operating system. Don’t just say “latest version.”
- Whether the failure happens during download, parsing, or connection, and the first related error in the logs.
- The results of updating directly, updating through a proxy, and testing on another network.
- Whether the response is configuration text, a webpage, or empty. You can describe its structure without sharing the full subscription content.
- Whether you changed networks, reset the subscription, changed the proxy port, or updated the client before the issue started.
Finally, contact the right party. For authorization errors, empty subscriptions, or malformed server output, ask the subscription provider to investigate. For local port connection refusals, client parsing support, or core configuration errors, continue checking your local settings. Specific evidence is more useful than repeated reinstalls and guesswork.