I use git extension. I wanted the password and username to be store in cache so I used: git-credential-winstore. It worked fine until I had to change the password in my com
Check the control panel / User Accounts and Family Safety / User Accounts, or directly the Credential Manager:
(Image from "Credential Manager - Where Windows Stores Passwords & Login Details")
You should be able to delete the faulty credential there.
I use http://[yourgitserverip]/Bonobo.Git.Server/Repository/[repositoryname] to change my password. Then;
Add this line (if does not exist):
[credential] helper = !\"C:/Program Files (x86)/GitExtensions/GitCredentialWinStore/git-credential-winstore.exe\"