Copydb doesn't work on mongos in 2.4.0 at all if auth is enabled. Should be trivial to match its behavior to mongod so that it at least works with old-style users.
- related to
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SERVER-7864 Make copyDB, cloneDB, etc. work with auth when using old-style users
- Closed
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SERVER-8213 Make copyDB and clone work with auth when using new-style users
- Closed