Simplewall v3.9.1 releases as hotfix for v3.9 regressions, adds TCP traffic stats
Maintenance pre-release from Henry++ lands one day after v3.9 beta, fixing svchost.exe notification spam and IGMP popup loops.
Simplewall v3.9.1 has landed. It's a maintenance pre-release published by developer Henry++ on 22 July 2026, exactly twenty-four hours after the v3.9 beta went live. The build addresses regressions introduced in yesterday's major update and adds a long-requested traffic statistics feature to the connections tab.
The v3.9 update brought a rule limit increase to 1,024 symbols, improved dark theme support, and a stack of crash fixes. But the broader code changes also introduced notification regressions that broke the user experience for several users. v3.9.1 is the cleanup. It's tagged as a pre-release on GitHub, which means you should treat it as a necessary step rather than a fully stable drop.
Traffic statistics for TCP connections
The Connections tab now displays download and upload speed alongside total bytes for TCP connections. The feature comes from PR #2100, contributed by @Tarkiin. It uses the GetPerTcpConnectionEStats API for real-time metrics.
The columns are numerically sortable. UDP rows remain empty because Windows doesn't expose equivalent per-connection UDP statistics through this API. Henry++ asked for a rewrite of the INT_ERROR handling and routine library integration during code review, so the final patch reflects that feedback.
Notification spam fixed
Issue #2107 described svchost.exe triggering a notification popup every ten seconds. The app appeared in the "with internet access" list, but the dialog kept reappearing and stole focus from other windows. Not a great way to spend your afternoon.
The root cause was likely the removal of the is_myprovider guard in v3.9, which meant Windows' own WFP filter blocks started firing Simplewall's popup dialog repeatedly. v3.9.1 re-gates these notifications so they only fire for traffic Simplewall actually controls.
Issue #2111 involved a different flavor of the same problem. IGMP traffic from the System process was triggering spam notification popups from Windows' default "Prompt the User" inbound filter. A new configuration option, IsExcludeInbound=true, allows users to suppress notifications for inbound traffic blocked by Windows' own rules.
If you upgraded to v3.9 and are seeing IGMP popup loops, adding that flag to your config file will kill the spam.
Pre-release caution
Keep in mind that v3.9.1 remains a pre-release. It addresses critical regressions, but the pre-release tag suggests Henry++ is reserving the right to iterate further before an official stable build. If you're running Simplewall in production, you might want to wait for the stable release unless the notification fixes are keeping you from using your machine right now.
Simplewall is a lightweight (~1 MB) open-source tool that configures the Windows Filtering Platform to manage network activity. It operates at the WFP layer beneath Windows Firewall and uses a default-deny posture. It supports Windows 7 SP1 through Windows 11, including ARM64, and is available as both installer and portable builds. The project has 8.6k GitHub stars and a history spanning 147 releases since May 2019.
Head here to download the release from GitHub
