How do you reset the stored credentials in 'git credential-osxkeychain'?

I'm not sure how to erase through the command line, but it's fairly easily to do it through the Keychain Access app. Just go to Applications -> Utilties -> Keychain Access, then enter "github.com". You can either delete the invalid item or update the password from with the app.

The solution turned out to be this:

The command git credential-osxkeychain was using the first GitHub account entry in my keychain. This one was not the one that had access to the projects in question.

I resolved the problem by touching the account in Keychain Access so that its date changed (I think I just changed the comment) and now that it became the most recent GitHub account it became the first one returned to credential-osxkeychain, and thus everything worked.

A better form of support for multiple GitHub accounts would be nice, but it is likely that most people only have one primary account and don't run into this problem.

From Terminal: (You need to enter the following three lines)

 $ git credential-osxkeychain erase ⏎
 host=github.com  ⏎
 protocol=https   ⏎
 ⏎
 ⏎

NOTE: after you enter “protocol=https” above you need to press ~~RETURN~~ TWICE (Each '⏎' is equivalent to a 'press enter/return' )

Try this in your command line.

git config --local credential.helper ""

It works for me every time when I have multiple GitHub accounts in OSX keychain