We have been running a private ethereum network for a couple of months.
Today we tried to add a new node to the network. When the node was
synchronizing, (after 3-4 hours) it stopped with the following message :
5a0e number=847268 hash=0000…0000 allowance=847268
WARN [03-23|15:11:45] Synchronization failed dropping peer
5a0e err="retrieved ancestor invalid"
We tried it again by starting from scratch (deleting all retrieved chain)
and the same problem appeared again at the same number=847268.
I will appreciate your help on resolving this issue.
Best Answer
I had the same problem but solved it in the following way.
Go to your chaindata directory like "/home/user/.ethereum/testnet/geth/chaindata"
Delete some of the recent ldb files and .log file. ( I've deleted 10 recent files.)