TortoiseGit TLS backend switch from OpenSSL to Schannel changes certificate trust behavior

Question

Configuration transitionTortoiseGit delegates HTTPS operations to the configured Git for Windows installation, which selects a TLS backend via http.sslBackend. Recent Git for Windows releases default to Schannel on Windows, while older bundled versions used OpenSSL with a curated CA bundle. This transition alters which root certificates are trusted during clone, fetch, and push operations.Constraints and uncertaintyThe exact TortoiseGit version where the bundled Git switched defaults is not pinned in public release notes, and the active backend can be overridden by user or system Git configuration. Corporate environments often install enterprise root CAs only in the Windows certificate store, making Schannel succeed where OpenSSL fails unless http.sslCAInfo points to a custom bundle. Proxy interception certificates add another layer: they are trusted by Schannel if added to the Windows store, but require explicit configuration for OpenSSL.QuestionsWhich TortoiseGit release first bundled a Git for Windows that defaults to http.sslBackend=schannel?Does the TortoiseGit Settings > Network proxy configuration apply to both backends identically, or does Schannel honor Windows system proxy settings independently?When both a bundled and a system Git are present, how does TortoiseGit resolve which http.sslBackend setting takes effect for a given repository?

Tasadduq Burney · Answer

TLS Backend in TortoiseGit
TortoiseGit delegates all HTTPS operations to the underlying Git for Windows installation. The http.sslBackend setting determines whether OpenSSL or Schannel handles TLS, which directly impacts certificate trust behavior.

Answers to Your Questions

Default Version: Git for Windows began defaulting to Schannel in version 2.17.0 (early 2018). Most TortoiseGit releases bundled with Git 2.17+ will use Schannel by default, though the exact switch point varies by TortoiseGit release.
Proxy Configuration: TortoiseGit's Network proxy settings configure Git variables like http.proxy. Schannel additionally respects Windows system proxy settings via WinHTTP, while OpenSSL relies solely on Git's proxy configuration.
Resolution Logic: TortoiseGit uses whichever Git executable is configured. The backend is resolved through Git's standard hierarchy: local (.git/config) > global (~/.gitconfig) > system (etc/gitconfig).

Trust Store Differences

Backend
Trust Store SourceCorporate Environment

OpenSSL
File-based CA bundle (ca-bundle.crt)
Requires manual CA import or http.sslCAInfo pointing to updated bundle

Schannel
Windows Certificate Store
Automatically trusts enterprise CAs deployed via Group Policy

Verification Commands
# Check active backend
>git config --get http.sslBackend

# Find which config file sets the backend
>git config --list --show-origin | grep sslBackend

# Test HTTPS connectivity
>git ls-remote https://[repository-url]

# Check Git version
>git --version

Switching to Schannel
To resolve certificate trust issues in corporate environments:
git config --global http.sslBackend schannel

Note: Verify your Git version supports the schannel keyword before switching.

TortoiseGit TLS backend switch from OpenSSL to Schannel changes certificate trust behavior

Configuration transition

Constraints and uncertainty

Questions

1 answer

TLS Backend in TortoiseGit

Answers to Your Questions

Trust Store Differences

Verification Commands

Switching to Schannel

Your perspective belongs here.

0 question comments

Backend	Trust Store Source	Corporate Environment
OpenSSL	File-based CA bundle (`ca-bundle.crt`)	Requires manual CA import or `http.sslCAInfo` pointing to updated bundle
Schannel	Windows Certificate Store	Automatically trusts enterprise CAs deployed via Group Policy