How Do You Fix the Core Exiting After Windows Sleep in FlClash?

FlClash v0.8.98 was released on 9/14/2026. The official Release lists only two fixes: keeping the Core running when Windows enters sleep and the desktop app is suspended, and rereading the file size and time after a Geo resource update completes.

The first fix addresses the IPC lifecycle among the FlClash desktop app, the Helper child process, and the Core. The old logic closed the IPC connection when a partial-frame write timed out, so the read loop then stopped the Core. The new logic keeps waiting through timeouts and closes the connection only on a hard error.

The second fix corrects UI state. The old version read the Geo file as soon as the update request returned, when the Core might not have finished writing it, so the resource page could keep showing the old size and time. The new version waits until the update state actually ends before rereading. This does not mean the old version necessarily failed to update the file, and it is not a GeoIP or GeoSite data-content update.

Do not refresh the subscription, switch nodes, or change DNS yet. Record the current FlClash version, Windows version, installer architecture, Profile, policy group, fixed node, and whether you use the system proxy or TUN. Complete a real HTTPS request to one target and confirm that it appears in Connections.

To validate the sleep issue, first use Task Manager or the FlClash status page to record that the Core is running, then put the computer into normal sleep and wake it. Keep the comparison minimal: the same Profile, node, network, and traffic-capture mode.

On the resource page, also record one Geo file that you actually plan to update, its current size, and its displayed time. This baseline is for determining whether the UI refreshes. Do not delete a Geo file to manufacture a change, and do not use a subscription, node, or rule set as the test file.

The FlClash fix commit specifically targets Windows Modern Standby. Microsoft documents powercfg /a as the way to view the sleep states supported by a computer.

If the output includes Standby (S0 Low Power Idle), the device uses this standby model. It may appear as Network Connected or Network Disconnected.

During Modern Standby, a desktop app may be suspended while a service or Helper child process remains in a different running state. In older FlClash versions, the app could stop reading while the Helper still held the Core, allowing a partial IPC frame write to time out.

If powercfg /a shows only traditional S3, or the computer was merely locked or had its display turned off without entering sleep, this causal chain does not directly apply. You can still upgrade to the stable release, but troubleshooting should continue with network-adapter recovery, the system proxy, TUN, DNS, and the node.

This fix is included in the official v0.8.98 Release, so you do not need a main-branch build. Most Windows computers with Intel or AMD processors should use windows-amd64-setup.exe; Windows on ARM devices should use windows-arm64-setup.exe.

The portable ZIP is only suitable for users who already use a portable directory and can manage the data location.

As of 9/17/2026, this site has verified and provides v0.8.98 backups, while retaining older files. To obtain these fixes, choose a v0.8.98 backup identified on the download page, or the matching asset from the official chen08209/FlClash Release, and compare the file hash with SHA256SUMS from the same Release.

Before installing, disable the system proxy or TUN, confirm that the device can connect directly, and fully exit from the FlClash menu. Keep the original configuration directory and pre-upgrade backup, and replace only the complete app. Do not copy a new Helper, Core, DLL, or resource file individually into the old installation directory.

After starting v0.8.98, first confirm that the version, Profile, policy selection, and previous traffic-capture mode are still correct. Complete one pre-sleep HTTPS request and confirm its record in Connections, then enter standby through the Windows sleep control. Do not change settings immediately after wake.

First check whether FlClash can still read the Core state, then access the same HTTPS target and look for a new entry in Connections. An open window does not prove that the Core is alive, and a displayed node-latency value does not prove that system traffic has recovered. The state, connection record, and real request must all succeed.

Repeat the same sleep-and-wake cycle at least twice so one fast network recovery is not mistaken for a fix. Use the same network, Profile, node, and mode each time. If the first cycle succeeds and the second fails, save the first app error and first Core error before moving to the other troubleshooting paths below.

On the v0.8.98 resource page, select the Geo item recorded before the upgrade and update it through the normal in-app control. Do not click repeatedly as soon as the update request returns, and do not overwrite the resource in a file manager. Wait until the item's updating state actually ends.

The new implementation rereads the file details when the update state changes from in progress to finished. If the official source actually returns a different file, the displayed size or time should refresh. If the remote content is unchanged, an identical size alone does not show that the fix failed.

This validation only proves that the UI rereads file properties at the correct time. Rule-matching problems, Geo download failures, checksum failures, or a Core that refuses to load the file must be investigated separately from the first error; repeatedly refreshing the page will not solve them.

If the Core remains alive after wake in v0.8.98 but the system cannot get online, this IPC fix is no longer the main failure point. Disable FlClash traffic capture and confirm direct connectivity, then check whether Wi-Fi or the wired adapter recovered, whether the system proxy still points to the current port, whether TUN and the Helper have permission, and whether DNS and the node work.

If the Core still stops, save the FlClash version, powercfg /a output, traffic-capture mode, first app error, and first Core error from before and after sleep. Do not reinstall the Helper, change the Profile, modify DNS, and switch nodes all at once, or you will not be able to tell whether v0.8.98 still has an uncovered IPC path.

If v0.8.98 cannot start, read the Profile, or preserve the previous proxy path on this computer, disable the system proxy and TUN, confirm that direct connectivity returns, and fully exit the app. After saving redacted logs and a copy of the current data, reinstall the complete official version that was verified to work before the upgrade.

You can roll back to a personally verified v0.8.97 or earlier stable version, but doing so removes the Windows sleep Core-survival and Geo detail-refresh fixes from this release. Do not insert only an old Helper, Core, or DLL into v0.8.98, and do not overwrite the official installation directory with a third-party portable package.

After restoring, import the pre-upgrade backup and repeat startup, HTTPS, sleep, and exit recovery with the same Profile, node, network, and traffic-capture mode. A consistently working old version and consistently failing v0.8.98 provide a comparison strong enough for further reporting.

As of 9/15/2026, v0.8.98 is the latest official stable FlClash release. It confirms only two included commits: 60f371a handles partial IPC frame-write timeouts during Windows Modern Standby, and c5bf5bd refreshes file details after the Geo update state ends.

If new v0.8.98 issues appear later, continue distinguishing a report, maintainer confirmation, a fix commit, and an official Release. One user report cannot be generalized into a platform-wide failure, and a commit on the main branch cannot replace a signed stable package.

This site verified v0.8.98 backups on 9/17/2026 and retains older files. For these fixes, verify v0.8.98, the architecture, and SHA256 shown on the download page or official Release, then validate the result in your own Windows workflow.