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Please open a git issue with the following details

  • Node version
  • Java command used
  • Operating System
  • JVM version
  • Storage location (Cloud, SSD, etc)
  • output of ERROR/WARN
tail -Fn+0 ergo.log | grep 'ERROR\|WARN' > output.log


Stuck on 'Active Syncronisation'

If your node is stuck on Active Syncronisation with no noticeable increase in the height, please attempt the following steps.

  1. Grep your log file using the commands from here to see if there's anything noticeably wrong.
  2. Shut down your instance, take a backup and attempt to restart.
  3. Join the #node channel on Discord for support or open an issue on GitHub.

Displays as 'Synchronised' even though it isn't.

If your node is displaying as synchronised even though the height does not match the latest one found on the explorer you can add this to your .conf file under ergo { node {

# A node is considering that the chain is synced if sees a block header with timestamp no more
# than headerChainDiff blocks on average from future
# 800 blocks ~= 1600 minutes (~1.1 days)
# headerChainDiff = 80

There is currently an open issue for a header downloading problem during synchronization

Lowering maxConnections

To allieviate some of the performance issues on later blocks please add the following to your ergo.conf

network {
        maxConnections = 10


This will lower the default maxConnections from 30 to 10, the sync will be slower but require less resources and sync smoother.

Is there any way to revert without resyncing?

The latest versions of the node will attempt to fix any errors itself, but if it fails - there is no way to manually roll-back.

Searching the logs

Here's some useful log greps

tail -Fn+0 ergo.log | grep 'ERROR\|WARN'
tail -Fn+0 ergo.log | grep 'ERROR'
tail -Fn+0 ergo.log | grep "not modified"
tail -Fn+0 ergo.log | grep ERR
tail -Fn+0 ergo.log | grep xception
tail -Fn+0 ergo.log | grep "stuck"

How do I resync from scratch?

To resync, remove the following two folders and restart the node.

rm -rf .ergo/state
rm -rf .ergo/history


My correct address/balance is not displayed

  1. Ensure the wallet is synchronised.
  2. Attempt to derive new addresses as per the swagger instructions.
  3. Ensure you derived the additional addresses during sync.
  4. Restore on an alternative wallet if unsuccessful.

Error Messages

Unable to define external address.

WARN [tor.default-dispatcher-11] s.c.n.NetworkController - 
Unable to define external address.
Specify it manually in ``

This warning means you aren't running a public node and can be ignored.

Got GetReaders request in state None

It is normal to recieve this in the first few minutes of starting the node.

This means that the database cannot be read. If this is happening continuously it likely indicates database corruption. This can happen due to unexpected shutdowns and also due to

WARN  [ergoref-api-dispatcher-9] 
Got GetReaders request in state (None,None,None,None)

To resync, remove the following two folders and restart the node.

rm -rf .ergo/state
rm -rf .ergo/history

Invalid z bytes

It has to do with parsing z value for this constructor

UncheckedSchnorr(dl, None, challenge, SecondDLogProverMessage(z))

cat ergo.log | grep -A 30 -B 30 "Invalid z bytes"


02:17:49.838 WARN  [tor.default-dispatcher-11] sigmastate.SigSerializer$ - Invalid z bytes for ProveDlog((f40ee9cecf47e36a18645e5a3cff677772d74ee2792912173aa406fa9a8a2ef4,4d058f2cdd0711eea49a9f289c4643391639a2e323be900b0e2e06cb562c45ba,1)): 6a5f7e7ee68762b61a0e8b64e353f66d0be523b7bf8d56b662112ec47e32ec7183525c9851a608885a34051bc971d6c8600c88d8ce1713

Dead Letters

tail -Fn+0 ergo.log | grep "akka.log-dead-letters"

In Akka, messages that can't be delivered are routed to a synthetic actor which has the path β€œ/deadLetters”. This is for NON transport lost messages. Akka makes no guarantees for lost messages at the transport layer. Existence of dead letters does not necessarily indicate a problem, but they are logged by default for the sake of caution

10:37:47.229 INFO  [ctor.default-dispatcher-6] s.c.n.PeerConnectionHandler - Peer handler to ConnectionId(remote=/, local=/MY_IP:9030, direction=Incoming) destroyed
10:37:47.213 INFO  [tor.default-dispatcher-14] s.c.n.PeerConnectionHandler - Peer handler to ConnectionId(remote=/, local=/MY_IP:9030, direction=Incoming) destroyed
10:37:47.239 INFO  [Thread-0] org.ergoplatform.ErgoApp - Stopping network services
10:37:47.245 INFO  [Thread-0] org.ergoplatform.ErgoApp - Stopping actors (incl. block generator)
[INFO] [akkaDeadLetter][06/11/2021 10:37:47.246] [] [akka://ergoref/user/networkController] Message [$ReceivableMessages$ShutdownNetwork$] to Actor[akka://ergoref/user/networkController#-2029702693] was not delivered. [4] dead letters encountered. If this is not an expected behavior then Actor[akka://ergoref/user/networkController#-2029702693] may have terminated unexpectedly. This logging can be turned off or adjusted with configuration settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.