To address this ERROR run this command as the root user on the OSSEC hub:
/var/ossec/bin/syscheck_update -a
Then restart OSSEC with this command:
service ossec-hids restart
ossec-analysisd: ERROR: Invalid integrity message in the database.
To address this ERROR run this command as the root user on the OSSEC hub:
/var/ossec/bin/syscheck_update -a
Then restart OSSEC with this command:
service ossec-hids restart