For users seeing “update failed,” an empty subscription, or no servers after import. Check the URL and HTTP status first, then direct and proxy paths, response format, and finally group and automatic update settings.
First Identify Where the Failure Occurs
A subscription update involves several steps. The client reads the subscription URL, sends an HTTP or HTTPS request, receives the server response, and parses it into VMess, VLESS, Trojan, or other server configurations. A successful request with a parsing failure is a different problem from a request that never reached the server.
Open the client log first and record the update time, status code, and first error. Do not delete all configurations immediately. If an old server still connects, use it to test the fallback path of updating the subscription through a proxy.
A 200 status code only means that the server returned content; it does not prove that the content is a valid subscription. A login page, expiration notice, or gateway error page may also return 200. If the log shows a parsing error, inspect the beginning of the response instead of clicking Update repeatedly.
Conclusion: Distinguish a Request Failure from a Parsing Failure
Timeouts, DNS resolution failures, and refused connections belong to the network stage; invalid characters, Base64 decoding errors, and missing valid configurations belong to the parsing stage. Handling each stage separately is usually more effective than repeatedly switching clients.
Four Common Causes and What to Do
The first category is an invalid subscription URL. Common causes include a reset link, an expired access token, a changed plan status, or parameters omitted from the end of the URL during copying. Being able to open the provider’s homepage in a browser does not mean the original subscription URL is still valid.
The second category is a blocked network path. DNS failures, an incorrect system clock, or restrictions on the target domain can cause HTTPS requests to fail. Direct access may also fail while updating through an existing proxy still works.
Error: The operation has timed out
Cause and fix: The request did not complete within the time limit. Switch networks, check the system DNS and clock, then try both “update without proxy” and the standard update.
Error: The remote server returned an error: (403) Forbidden
Cause and fix: The server rejected the current URL or request. Copy the complete subscription link again and verify the account status. If 403 continues, obtain a new valid URL.
Error: No such host is known
Cause and fix: DNS resolution failed. Check that the domain was copied correctly, switch to a reliable DNS service, then restart the client and try again.
Error: base64: illegal base64 data at input byte
Cause and fix: The response is not a complete Base64 subscription, or it was replaced by an error page. Check whether the response starts with HTML and confirm that the server output matches the client’s supported format.
Error: invalid character '<' looking for beginning of value
Cause and fix: The client expected JSON but received a web page beginning with “<”. This is usually a login page, verification page, or gateway error page; resolve the URL or access restriction first.
The third category is an incompatible format. A subscription may contain one share link per line, Base64-encoded text, or client-specific JSON. Native V2Ray JSON describes a complete runtime configuration; it is not the same as a general subscription containing multiple servers. Giving the client a web page, a full configuration file, or a format intended for another app may result in “no valid configuration.”
The fourth category is an incorrect client setting. For example, the subscription may be assigned to the wrong group, the group may be disabled, the update mode may be wrong, or the local proxy port may not match the system proxy configuration. Older v2rayN configurations commonly use 10808 for SOCKS and 10809 for HTTP; use the actual local values shown under “Settings” → “Parameter settings.”
| Symptom | Check first | Do not do first |
|---|---|---|
| Immediate 401 or 403 response | Subscription URL, token, and account status | Repeatedly switch cores |
| Timeout after a long wait | DNS, network, direct access, and proxy path | Delete all old servers |
| Download completes but imports zero servers | Response format and group filters | Judge success by the status code alone |
| Manual update works, automatic update fails | Update interval, update on startup, and background restrictions | Shorten the update interval repeatedly |
v2rayN Manual Troubleshooting and Recovery
v2rayN is best checked with one observable manual update first. Before starting, note the current subscription group name and keep at least one previously working server. Menu labels may vary slightly between 7.x releases, but the relevant controls are under “Subscription groups” and “Settings.”
Check the Subscription URL
Open “Subscription groups” → “Subscription group settings” and select the relevant group. Make sure there are no spaces, line breaks, or duplicated characters around the URL, and confirm that the group is enabled.
Run a Direct Update
Under “Subscription groups,” choose “Update all subscriptions (without proxy).” If it succeeds, the URL and format are basically valid, so the original issue is likely in the local proxy path.
Run a Proxied Update
Connect to a confirmed working server, then run the standard “Update all subscriptions.” If the proxied update works but the direct update fails, continue checking the current network and DNS.
Check the First Log Error
Open the log area on the main screen and locate the first error near the latest update time. Subsequent cascading errors are less useful; the first timeout, status code, or parsing error is more likely to reveal the root cause.
Refresh the Group Results
After the update finishes, return to the server list and filter by subscription group. If the servers were written but are not visible, clear the search term and protocol filter, then reload the list.
VMess, VLESS, and Trojan are server protocol types; they do not determine whether the subscription request can complete. A 403 or timeout during an update is usually unrelated to the selected Xray or V2Fly core. Check core capabilities only when the subscription has been written successfully but starting a server reports “this configuration item is not supported.”
Conclusion: Keep Two Update Paths
Use direct updates to test the local network, and proxied updates when the target URL is reachable only through an existing proxy. Keeping at least one working path prevents the loss of an old server from leaving you unable to fetch a new subscription.
v2rayNG Manual Updates and Format Checks
v2rayNG runs server configurations with the Xray core, while subscription downloads are initiated from the client interface. Distinguish between a failed subscription download and a failed server startup: the former is indicated by the subscription update message, while the latter appears in the runtime log after starting an individual configuration.
Mobile and Wi-Fi networks may use different DNS services and access policies. When an update fails on one network, switch to the other for a comparison test. If the result changes with the network, address the network path first instead of recreating every subscription.
Open Group Settings
Open “Subscription group settings” from the main menu and select an existing group or create one. Paste the complete subscription URL and enter a recognizable name.
Verify the Enabled Status
Confirm that the target group is enabled. With multiple groups, check that the current update command covers all enabled groups so that you do not refresh a different URL by mistake.
Update the Subscription
Return to the main screen, open the menu, and select “Update subscription.” Wait for the result message before switching pages so the system does not suspend the client task while the request is still running.
Check the Import Count
After a successful update message, inspect the configuration list. If the count is zero, check whether the response is a list of Base64 share links or a format intended for another client.
Start a Single Configuration
Select and start one newly imported configuration. If the subscription succeeds but the connection fails, then check the server address, port, transport, TLS, and routing settings.
Error: no valid profile found
Cause and fix: The response contains no recognizable share links or configuration objects. Confirm that the subscription output targets V2Ray/Xray clients, remove any group format filters, and try again.
Error: connection refused
Cause and fix: The target host actively refused the connection, possibly because the port is closed or the address is incorrect. If this occurs during the subscription request, verify the subscription domain and port again.
If the same URL parses in v2rayN but not in v2rayNG, first compare the client versions and response formats rather than replacing the subscription with a single parsed server. A single share link restores one configuration only and cannot preserve the subscription group relationship.
What to Check When Setting Up Automatic Updates
Automatic updates are meant to refresh existing groups on a schedule, not to run as often as possible. Short intervals create more failure logs and may trigger server-side rate limits. Start with 1440 minutes, or once every 24 hours; use 360 or 720 minutes only when servers change more frequently.
Automatic updates also require the client to remain running. A fully closed desktop client or a mobile task suspended by the system cannot run on schedule. Keep an update-on-startup option or a manual update entry point available as well.
v2rayN Automatic Update Settings
Open Parameter Settings
Go to “Settings” → “Parameter settings” and look for subscription or automatic update options. In some 7.x versions, these options may appear on the v2rayN settings tab.
Set the Update Interval
Start with 1440 minutes and save. Do not reduce the interval to a few minutes, which can send repeated requests to the same subscription URL in a short period.
Choose the Update Path
Choose standard updates or updates without a proxy based on the manual test results. If the subscription requires an old server, make sure a working connection is established after startup.
Verify the Run History
After one scheduled time has passed, check the log for an update entry for the relevant group and verify that the server list’s modified time has changed.
v2rayNG Automatic Update Settings
Open Subscription Settings
Open the subscription-related settings under “Settings” and enable automatic updates. If the current version offers update on startup, enable it as a backup as well.
Set a Sensible Interval
Set the update interval to at least 24 hours. Switch to 12 hours only when faster synchronization is necessary; frequent repeated testing is not recommended.
Allow Background Execution
Make sure the system does not immediately suspend network tasks while the client is running. Automatic updates can occur only when the client process is able to run and the network is available.
Check the Result the Next Day
Check the group update time and server list. You can confirm the full automatic update path only when the timestamp changes and the new configurations start successfully.
Post-Update Verification Checklist
After the client says “Update complete,” verify that the result actually works. At minimum, confirm that the response was parsed, the group was written successfully, a server can start, and routing behaves as expected. Seeing more server names alone does not prove that the connection path is working.
- Confirm that the target subscription group’s update time changed, rather than another group being refreshed.
- Clear the search and protocol filters, then verify that VMess, VLESS, and Trojan configurations appear normally.
- Start two servers from different regions at random to rule out a single failed server.
- Open the log and confirm there are no DNS failures, port conflicts, or core configuration errors.
- Check the routing mode to avoid mistaking an incorrect rule match for a connection problem after a successful update.
- Keep the last working configuration until the new subscription has run reliably, then remove old records.
Why Does the Client Fail When the Subscription URL Works in a Browser?
A browser may retain a login session, verification data, or its own proxy settings, so the client request may not have the same conditions. Use the status code and response format in the client log as the source of truth.
What If the Subscription Updates Successfully but Adds No Servers?
First clear the group and protocol filters, then check whether the server response is identical to the previous one. If it contains no valid share links, the client may have completed the download without being able to write configurations.
Can Switching the Xray or V2Fly Core Fix Subscription Timeouts?
Usually not. A subscription timeout occurs during the URL request stage, so check DNS, the network, and the proxy path first. The core mainly affects configuration startup and protocol feature support.
Final Check: Confirm the Fix with a Complete End-to-End Test
The subscription issue is resolved only when all four conditions are met: a manual update succeeds, the group timestamp changes, at least two new configurations start successfully, and the next automatic task runs normally.