500 Server error on login about goread HOT 6 CLOSED

Another user report similar behavior on both firefox and chrome only after he was signed in to 5 google accounts.

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I've posted this to the google-appengine group: https://groups.google.com/forum/#!topic/google-appengine/PTxH7Bgfd18

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The above case is where I have one gmail accounts and the rest are Google apps accounts belonging to my personal domains. The error did not occur when I had 2 accounts (adding one account to the Gmail). What I am not sure is if it has something to with a specific account in that list.

The same account list hasn't caused any errors when I logged in using the same account on the same browsers to other sites.

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I also had this problem when signed into multiple accounts.

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I got this error when logging in 4 accounts.
It works on logging in 3 accounts.

We can not control the number of accounts a user login at the same time.
I think it is a critical bug in the implementation of Google.

Conclusion, Users API is not usable. The only way is to use OAuth.

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Closing because not my bug.

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