I have had a problem by changing the GIT password in Eclipse. Eclipse could not change the password in the secure storage and I couldn’t use GIT anymore. You schould do following:
Eclipse go to Preferences -> General -> Security -> Secure storage and in Contents tab delete “Default Secure Storage” and restarted Eclipse.
Now when you try to pull your Project you will be asked for a username and password you should check the checkbox store the password and then it will be saved in secure storage and you can use GIT again.
Velislav Krastev Blog 
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