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This question already has an answer here:

according to https://testnet.etherscan.io/, the last block has been mined more than 12 hours ago, whereas before more than one were mined per minute. Has the difficulty changed so much ? Or has the testnet problems ?

marked as duplicate by eth Nov 21 '16 at 3:42

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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The testnet was reset due to various complications, one being a consensus issue between Geth and Parity. You can read about it here:

https://blog.ethereum.org/2016/11/20/from-morden-to-ropsten/

See the bottom of the page for instructions on running on the new testnet, Ropsten.

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