How do I fix the error “out-of-sync”?

applies to ALL
branch ALL

updated October 31, 2018, 7:53 am

The error message “x hours behind” or “out-of-sync” is triggered when the last block is mined longer ago than the block time of your coin.

E.G. Blocktime : 10 minutes, last block mined 30 minutes ago.

This message will disappear when the first or next block is mined.