These errors are seen after commit:

error: remote commit-configuration failed on node

error: configuration check-out failed

IDP related configuration fails to be committed on one node de to unknown attack error however both nodes run the same IDP database version

If you are unable to commit an IDP related configuration due to 'Unknown attack' on one of the nodes and even though they run the same IDP database version note that this may be due to a transient issue, in this case please consider reinstalling the IDP database using the "request security idp security-package install" with the already downloaded files and try to commit again.

If the above step doesn't work check for any core dumps (using "show system core-dumps") on the device that is failing to commit the configuration or consider performing a fresh download and install of the IDP signature package.