Clash Nyanpasu Subscription Update Failed: 6 Causes and How to Troubleshoot

First, identify the failure: download, parsing, or configuration loading

Updating a subscription in Clash Nyanpasu generally involves three steps: the client requests the subscription URL, receives a response, then parses the configuration and passes it to the core. The “update failed” message may be a catch-all. A connection timeout, a login page returned instead of a config, and a rule referencing a nonexistent proxy group can all interrupt an update, but each requires a different fix.

This guide focuses on configurations used with the mihomo core. Clash Nyanpasu is the client; mihomo handles proxying and rule execution. A successful download does not mean the active core supports every field in the file. Before troubleshooting, keep a copy of any configuration that still works. Don’t delete all your subscriptions just to retry.

1. Note your setup: Record your operating system, Clash Nyanpasu version, selected core, and core version. Find version numbers on the About page or in the core startup log—“latest version” isn’t specific enough.
2. Note when it started: Did the initial import fail, or did an existing subscription suddenly stop updating? Do other subscriptions fail too?
3. Retry just once: Note the time on the log page, update the affected configuration, and save the errors from around that time.
4. Protect your credentials: Before sharing logs, remove subscription URL query parameters, tokens in URL paths, node passwords, and authentication headers.

Subscription URLs often contain account credentials. Never post the full URL to a public YAML checker, online converter, or screenshot in a comment thread. If you need to inspect the response, do it locally whenever possible.

Cause 1: Expired subscription URL, invalid token, or changed account access

If the subscription used to update but now returns 401, 403, or 404, check your account access first. A password change, subscription reset, expired plan, or server migration can invalidate an old URL. Status codes only narrow down the possibilities, though: 403 may come from access protection, and 404 may mean the URL path was copied incorrectly.

What to check

• Sign in to your provider’s account page, check your plan status and subscription options, and copy the correct Clash or mihomo subscription URL again.
• Make sure the URL is complete, especially the parameters after ?. Line breaks added by chat apps, trailing punctuation, or extra spaces can change the request.
• Check that you didn’t copy your account homepage, a share page, or a QR code image URL. These may open in a browser, but they aren’t subscription endpoints.
• If you recently reset your subscription token, update the saved URL in the client too. Repeatedly retrying the old URL won’t restore access.

Being able to open your account page in a browser doesn’t prove the subscription URL works. The browser may send your login cookies, while the client’s subscription updater usually won’t inherit that session. Check the actual status code and response body from the subscription endpoint.

Cause 2: DNS, TLS, or proxy routing prevents the request from completing

If the log shows timeout, connection refused, no such host, or a certificate error, start by checking the connection. The client often hasn’t received a subscription body it can parse yet, so changing YAML indentation won’t help.

If your version offers a proxy option for subscription updates, record the results both with a direct connection and through a proxy. Option names and locations may differ between versions. Don’t assume that enabling the system proxy means the subscription downloader will use it. TUN routing also depends on route settings, excluded processes, and the client implementation, so check logs and connection records.

A common deadlock: the subscription domain requires a proxy, but the only working node is in a subscription you haven’t imported yet. Keep an existing working configuration, or update from a trusted network that can reach the subscription domain—instead of repeatedly switching rule modes. If you encounter a certificate error, don’t disable certificate verification. Fix the system clock or investigate the network first.

Cause 3: The server responds, but not with a complete Clash configuration

200 OK only means the server returned a response; it doesn’t guarantee the response is a configuration file. A subscription endpoint may return an HTML login page, a JSON error, a Base64-encoded node list, or a provider file containing only proxy nodes. These require different handling and can’t all be imported as complete configurations.

Check the start of the response to identify its content

• Starts with <!doctype html> or <html: It’s usually a webpage, login prompt, or access verification page.
• Contains JSON fields such as error or message: Read the server’s error first. It may indicate a quota, access, or parameter issue.
• A long string of encoded characters, or multiple lines of URIs such as ss:// or vmess://: This may be a generic node subscription, not a complete Clash YAML file.
• Only a list of nodes under proxies:: This may be a file intended for a proxy-providers reference; it may not include usable proxy groups or routing rules.

On your provider’s website, choose an output format compatible with Clash Meta or mihomo. Simply changing the file extension to .yaml won’t help, and not every “Clash subscription” contains the same fields. A full configuration typically includes nodes or proxy collections, proxy groups, and rules, but the exact structure depends on its purpose.

If the download returns an access verification page, check the endpoint URL and access restrictions with your provider. A browser showing the page after verification doesn’t mean the client can run the same page scripts.

Cause 4: YAML syntax is broken by indentation, special characters, or duplicate keys

If the log shows yaml:, did not find expected key, or a syntax error with a line number, inspect the YAML. The line number often marks where the parser got stuck, but the actual issue may be on the previous line—for example, an unclosed quote or a change in list indentation.

Four common things to check

1. Indent with spaces, never tabs. Keep indentation consistent at each level; two spaces per level is common.
2. Use an English colon between keys and values, followed by a space. Don’t write name: with a full-width colon.
3. Quote names or passwords that contain special characters such as a colon followed by a space or a hash sign, so they aren’t misread as structure or comments.
4. Check for duplicate top-level keys, such as pasting in two rules: sections. Parsers may report an error or overwrite the earlier value, so don’t rely on this behavior.

Here’s a local test configuration for checking indentation and basic structure. It has no proxy nodes, so all connections go direct according to the rules. 7890 is only an example listening port; it doesn’t indicate your client’s current port and must not conflict with another service already listening.

mixed-port: 7890
allow-lan: false
mode: rule
log-level: info

proxies: []

proxy-groups:
  - name: "Manual Select"
    type: select
    proxies:
      - DIRECT

rules:
  - MATCH,Manual Select

If the test file loads but the subscription doesn’t, compare the original file contents next—but that alone doesn’t prove the network layer is working perfectly. Don’t edit your only copy of the original subscription; make a local test copy first. Remote updates usually replace downloaded content. For persistent changes, use an override or merge mechanism supported by your version.

Cause 5: Valid YAML, but incompatible core fields or references

A YAML file being readable only means its syntax is valid. The configuration must also pass the core’s structural and reference checks. For example, if a rule points to Overseas Proxy but the actual name in proxy-groups is Overseas Nodes, loading may fail because the referenced proxy group doesn’t exist. Check names character by character, including spaces, capitalization, and symbols.

• Check the active core: Confirm in the core selector and startup log that mihomo is actually running. A subscription button labeled “Meta” doesn’t prove the active core is compatible.
• Check node types and fields: New protocols or options may require a newer core. Look up the specific error in the documentation for your version before deciding to upgrade—don’t delete authentication fields at random.
• Check proxy group references: Rule targets must refer to a defined proxy group or built-in target, and every node listed in a group must exist.
• Check external providers: Failed downloads from proxy-providers and rule-providers are separate requests. A successful main subscription update doesn’t mean those providers have updated too.

Be sure to distinguish “configuration updated” from “configuration activated.” The former may only mean the file was downloaded and saved; the latter involves core parsing, listening ports, and external resources. If the log reports a port conflict, check your listening settings—it’s not a damaged subscription. For more on routing structure, see the configuration notes in the technical reference.

Cause 6: The server rejects the User-Agent or returns different content by client

Some subscription endpoints inspect the request’s User-Agent header to choose a configuration format or reject requests that don’t meet their access policy. So if the same URL works in a browser but fails in the client, the cause may be the request headers—not just differences in cookies.

A typical clue is that the network connection succeeds, but the client receives 403, a specific access-denied message, or a different response body from the browser. A URL opening in a browser doesn’t prove the User-Agent is the problem. Compare status codes and response bodies using the same URL on the same network.

Recommended order of checks

1. First, check whether your provider offers a dedicated Clash Meta or mihomo subscription endpoint. Don’t change global request headers as a first step.
2. If your provider explicitly requires a particular User-Agent, check whether your client version lets you set request headers for that subscription.
3. Change one setting at a time, then retry the update and record the status code. Avoid changing the network, URL, and core simultaneously, or you’ll lose the ability to compare results.
4. If the server still returns an access verification or permission error, send the provider the redacted results. Don’t try to bypass its access restrictions.

Request headers under proxy-providers only apply to requests for those proxy providers; they don’t automatically change the headers the client sends to fetch the main subscription. Core requests and the client’s subscription downloader operate at different layers.

Find the cause in client logs: capture a clear trail with one update

Open the client’s log page or log file and note the current time, such as 14:32:10. Then return to the configuration list and update the affected subscription once. Menu names may vary between versions; the key is to check both client-side download errors and core-side configuration errors—not just the connection list.

1. Start with the request result: Search for the subscription domain, status, timeout, and certificate. Check whether the client received a response before investigating its contents.
2. Then check for parsing errors: Search for yaml, parse, and line. Record the full error and about 10 lines of context before and after it.
3. Finally, check loading errors: Look for proxy group references, node types, provider downloads, and listening ports. Distinguish the main configuration URL from external provider URLs.
4. Increase the log level only if needed: If your version offers debug logging, enable it briefly and reproduce the issue once. Restore your usual level afterward to avoid retaining excessive connection details.

When reporting an issue, include at least: client and core versions, operating system version, time of failure, exact error text, HTTP status code if available, whether only one subscription fails, and the results of each individual check. Include only the few response lines needed to identify the format. Remove node addresses, passwords, tokens, and account details.

Four checks after a successful update

• The subscription’s update time changed, and the node count roughly matches the provider’s description.
• The target configuration is selected and activated—not merely downloaded.
• Proxy groups can select the expected nodes, and external rule sets aren’t repeatedly failing to download.
• When you browse, the policy shown in the connection record matches what you expect. A successful latency test doesn’t mean every app is routed through the proxy.

Check in this order: “Did the request succeed? → Is the response correct? → Is the YAML valid? → Can the core load it?” This is usually faster than reinstalling the client repeatedly. If problems persist, consult the FAQ to check the scope of system proxy and TUN routing. They affect traffic paths, but won’t fix an expired URL or invalid configuration.