Supermium causing SChannel Error Events in Windows 7 System Event Log
Opened this issue · 4 comments
Describe the bug
Starting and using Supermium is causing the Windows 7 Local Security Authority Subsystem Service (lsass.exe) to generate lots (5 per second) of SChannel Error Events (EventID 36887, AlertDesc 40 & 70) in the System Event Log. This does not happen running (an old copy of) Edge.
Does not seem to be causing too much of a problem, except for being slow.
To Reproduce
- Run Supermium and navigate to various pages - even its own settings page.
- Run Event Viewer and you can see the events.
- Keep hitting Refresh in Event Viewer to see the Events being constantly created.
- Close Supermium and open Edge (and presumably any other browser) .
- Navigate to same pages as before and not that SChannel Errors are not generated.
Expected behavior
Supermium runs without causing lsass.exe to generate SChannel Errors.
Screenshots
Example copied from EventViewer:
Log Name: System
Source: Schannel
Date: 16/08/2025 14:34:06
Event ID: 36887
Task Category: None
Level: Error
Keywords:
User: SYSTEM
Computer: MedionLaptop
Description:
The following fatal alert was received: 40.
Event Xml:
36887
0
2
0
0
0x8000000000000000
749766
System
MedionLaptop
40
Desktop (please complete the following information):
- OS: Windows 7 Home Premium Service Pack 1 32Bit
- Supermium: Version 132.0.6834.226 (Official Build) (32-bit)
Additional context
Have used https://github.com/asheroto/UpdateRootCertificates to ensure Security Certs are up to date - made no difference.
SSL3_ALERT_HANDSHAKE_FAILURE. Spurious error - not easy to reproduce.
OS:Windows 7 Ultimate Service Pack 1 64-bit
Supermium: Version 132.0.6834.226 (Official Build) 64-bit
Supermium occasionally experiences lag or crashes; the logs show similar errors as well.
-bit)
@win32ss My issue is not spurious, it happens constantly. As soon as I start Supermium (which does reopen previous tabs - will check with no tabs later) my event log gets flooded - every time - and this continues until I close Supermium.
I have confirmed that you do not need to view any web page - just open Supermium with a single new tab and watch the S-Channel events build up. @win32ss - As you say this might be hard to reproduce I am happy to provide more diagnostic information if asked, because it is definitely repeatable (unstoppable in fact) on my system. Many thanks.