CodeCommit Git Windows fatal: Failed to write item to store [0x6c6]

Question

Is there a solution for the *fatal* message *0x6c6* that shows up in git-bash for Windows? It's annoying since it appears that operations continue normally other than the "fatal" part. My coworkers using Windows experience the same problem.  I've included the full error along with the  *GIT_TRACE=1* info.

09:45:39.933420 run-command.c:654       trace: run_command: 'git credential-manager-core store'
    09:45:40.042896 exec-cmd.c:237          trace: resolved executable dir: C:/Users/xxxxxxxx/AppData/Local/Programs/Git/mingw64/libexec/git-core
    09:45:40.042896 git.c:748               trace: exec: git-credential-manager-core store
    09:45:40.042896 run-command.c:654       trace: run_command: git-credential-manager-core store
    fatal: Failed to write item to store. [0x6c6]
    fatal: The array bounds are invalid

This is a newly setup Win10 Pro system.  I'm using the following: git 2.36.1, Python 3.10.4, git-remote-codecommit 1.16, and we use a non AWS identity provider for SSO.

$ aws --version
    aws-cli/2.6.3 Python/3.9.11 Windows/10 exe/AMD64 prompt/off

Here's ~/.gitconfig on the affected system.

[credential "url pointing to aws codecommit"]
        provider = generic
    [protocol "codecommit"]
        allow = always

Here's part of the repo .git/config

[core]
        repositoryformatversion = 0
        filemode = false
        bare = false
        logallrefupdates = true
        symlinks = false
        ignorecase = true
    [submodule]
        active = .
    [remote "origin"]
        url = codecommit::region://repo-name
        fetch = +refs/heads/*:refs/remotes/origin/*
    [branch "master"]
        remote = origin
        merge = refs/heads/master

Linux systems don't have this problem.

Answer

Don't know if this will help as we are using SSO through AWS config files, but I uninstalled Git and then reinstalled Git but did not install the credentials manager. After closing and re-opening VS Code, I run git pull on our repo and got none of the fatal errors.

Answer

To fix the error below in Windows when cloning a repository from CodeCommit using federated access, temporary credentials, or a web identity provider:

> fatal: Failed to write item to store. [0x6c6]  
fatal: The array bounds are invalid

You just reinstall git by changing “Choose a credential helper” from “Git Credential Manager” to None. The recommended method is to install and use the git-remote-codecommit utility, as stated below:

[https://docs.aws.amazon.com/codecommit/latest/userguide/setting-up-https-windows.html]()

> Although the credential helper is a supported method for connecting to CodeCommit using federated access, an identity provider, or temporary credentials, **the recommended method is to install and use the git-remote-codecommit utility**. For more information, see [Setup steps for HTTPS connections to AWS CodeCommit with git-remote-codecommit](https://docs.aws.amazon.com/codecommit/latest/userguide/setting-up-git-remote-codecommit.html).

Answer

This answer assumes the problem is an installed git-credential-manager-core (the most recent generation of git-credential-manager from MS). This could be because of a need for other repos that are not CodeCommit. The original poster's question had a trace output from git that shows the invocation of the `git-credential-manager-core store` command. 
If GCM is installed, it cannot help with CodeCommit stuff and its automatic invocation causes the error messages.

In that case, in your CodeCommit repo that should not use GCM, do following:

In the local .git/config  file (**MAKE A BACKUP COPY OF THE FILE ** before editing!) of the repo involved, add

```
[credential]
   helper=""
```

Details under which this solution works (my setup):

* Win11
* Git version 2.39.1.windows.1
* Git GCM version 2.0.886+ea93cb5158
* AWS git-remote-codecommit 1.16

Answer

This is an [issue with the git credential manager](https://github.com/GitCredentialManager/git-credential-manager/issues/245). You will need to update to the latest release. I recently confirmed this on a windows machine.

CodeCommit Git Windows fatal: Failed to write item to store [0x6c6]

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