Git For Windows Curl -43- A Libcurl Function Was Given A Bad Argument Jun 2026

Some corporate networks require Schannel. Set it correctly:

In some cases, the error is triggered by SSL certificate verification failures. You can try manually updating your CA bundle by downloading the latest version from curl.se and placing it in C:\Program Files\Git\mingw64\bin as curl-ca-bundle.crt . git update-git-for-windows command fails with "curl

When Git initiates a secure connection (HTTPS), it passes instructions to cURL. These instructions include details like "use this proxy," "connect to this port," or "verify the SSL certificate using this file." If cURL receives an instruction it cannot process—perhaps a file path that doesn't exist, a certificate format it can't read, or a proxy configuration string that is malformed—it throws Error 43. Some corporate networks require Schannel

If that fails with error 43, the problem is within your curl/libcurl installation.

If you urgently need to clone a repo:

Git for Windows allows you to switch between these two. Problems arise when Git is configured to use one backend, but the underlying cURL library receives arguments formatted for the other, or when it tries to use a specific certificate file that doesn't exist or isn't accessible.

Then retry your Git operation.

If updating Git doesn't work, you may have a "stale" version of libcurl.dll in your system path. libcurl-4.dll issues with 2.14 packages

with self-signed certificates:

git config --global http.sslVerify false

If that also fails with error 43, your libcurl installation is broken. Reinstalling Git for Windows fixes it. git update-git-for-windows command fails with "curl When Git