Troubleshoot a node running on Windows#

This guide describes how to troubleshoot a node running on Windows on the Concordium network.

Event viewer#

Use the Event viewer to get more information about the problem. In the Search bar, search for Event viewer. In the Windows Logs click Application. Use the warnings and errors to diagnose the issue.


Node crash or database corruption#

A node crash or database corruption is the problem if:

  • the node fails to start

  • the node is in a restart loop with an error message about database corruption

  • or you get a “too few bytes” message.

The solution is to delete the relevant portion of the database.

The database directory should contain matching pairs of blockstate-$i.dat and treestate-$i files for some number of consecutive i’s starting at 0. The number of the files differs depending on which protocol version is current.


To resolve a crash or non-starting node, delete files, starting at the largest i, until the node starts or until there are no more files in the directory.

  • If only one of treestate-i or blockstate-$i.dat files exists, delete the other and try starting the node.

  • Otherwise delete both files of the treestate-$i and blockstate-$i.dat pair and try starting the node.

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