Ethereum Error authentication needed password or unlock

Question

I am using azure ethereum consortium network with Geth and MetaMask. and the following error is happening randomly:

0|server | (node:99208) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 53): Error: authentication needed: password or unlock

Sometimes the api call pass through successfully, and sometimes nodejs app logs show this. I unlocked the account multiple times using multiple ways giving me "true" boulean as follows:

personal.unlockAccount(eth.coinbase, "cDxxxxxxxxKaYZ", 300)

geth --exec "personal.unlockAccount(eth.accounts[0], 'cDb xxxxxxxKaYZ', 1000)" attach

Answer 1

First, make sure you have an account.

web3.personal.listAccounts

If you get [] ...

web3.personal.newAccount()

Next run

web3.personal.unlockAccount(web3.personal.listAccounts[0],"<password>", 15000)

this will unlock the first account with this password for 15,000 seconds. 

This should solve your error.

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Thanks.