Hey there, let's work through this Git push error you're hitting in Visual Studio—since you can't install the Git command line tool, we'll focus entirely on fixes you can do right within the IDE and Windows itself.

Common Causes & Fixes #

1. Verify Git Configurations in Visual Studio

First, double-check your Git settings to make sure nothing's misconfigured:

• Open Visual Studio and go to Tools > Options > Source Control > Git Global Settings. Confirm your username and email are correctly set (matching what's linked to your remote repo).
• Right-click your repository in the Solution Explorer, select Git > Settings to open the repository-specific config. Ensure the remote URL (under "Remotes") is correct—no typos, and confirm it's using the right protocol (HTTPS/SSH) for your repo host.

2. Fix Credential Authentication Issues

This error often pops up when Visual Studio can't authenticate with your remote repo. Here's how to reset your credentials without CLI:

• Open Windows Credential Manager (search for it in the Start Menu). Go to Windows Credentials and look for entries related to your Git repo (e.g., git:https://github.com or git:https://dev.azure.com).
• Delete those credentials, then go back to Visual Studio and try pushing again. You'll be prompted to re-enter your login details—if you're using GitHub/GitLab/Azure DevOps, use a Personal Access Token (PAT) instead of a password (many platforms no longer accept password auth for Git operations).
• For Azure DevOps specifically, you can also go to Team Explorer > Manage Connections, sign out of your account, then sign back in to refresh your credentials.

3. Tweak Git Network Config via VS

You can edit your global .gitconfig directly from Visual Studio to adjust network settings:

• Go to Tools > Options > Source Control > Git Global Settings, then click Edit global .gitconfig.
• Add or modify these lines to address common network-related issues:

  [http]
      postBuffer = 524288000  # Increase buffer size for large file pushes
      sslVerify = false       # Temporarily disable SSL check (test if certs are the issue—re-enable later if possible)
  [https]
      sslVerify = false
  

• Save the file, restart Visual Studio, and try pushing again. Note: Disabling SSL verification is a temporary test—if it fixes the problem, check your system's SSL certificate store for missing or expired certificates instead of leaving it off.

4. Clear Stuck Git Lock Files

Sometimes a leftover lock file can block Git operations:

• Close Visual Studio entirely.
• Navigate to your local repo folder, show hidden files (File Explorer > View > Hidden items), and open the .git folder.
• Delete the index.lock file if it exists, then restart Visual Studio and retry the push.

5. Check Proxy Settings

If you're on a network with a proxy, it might be interfering with Git's HTTPS requests:

• In Visual Studio, go to Tools > Options > Environment > Web Browser > Proxy Settings.
• Confirm the proxy settings are correct for your network, or try temporarily disabling the proxy (if allowed) to see if that resolves the issue.

内容的提问来源于stack exchange，提问作者Zaldimmar