Eclipse error on deploying AppEngine project

I am using the Eclipse with the Google AppEngine plugins (Java) and following the http://code.google.com/appengine/docs/java/gettingstarted/uploading.html tutorial.

Everything works fine locally, but when I try to deploy to AppEngine I get an error

"Error While signing in"

An error occurred while trying to sign in 400 bad request. See the error logs for more details.

This error is before I enter any login info or anything.

I am copy/pasting the App ID from the AppEngine website so Im pretty sure I got it right.

I have no idea where the logs are on this thing, so any help there would also be 开发者_开发问答appreciated.

Try logging out and back in again. That worked for me.

Change your proxy settings! Please go to Window -> Preferences Then from General find Network Connections and update your proxy settings.

This must solve your issue.