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.