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Consider a following scenario for a multi node private blockchain network:

If one node is down, how can I access accounts created on that node from another node without having private key of the account?

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If one node is down, how can I access accounts created on that node from another node as the private keys are residing on the node which is down?

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You have actually answered the question yourself. In order to act on behalf of an account, you need its private key. As such, if the node is down it is impossible to retrieve any accounts associated with it through other nodes.

That would defeat the purpose of having a blockchain as a blockchain network consists of peers whose owners you do not necessarily trust, let alone entrust with the private key(s) to your account(s).

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