Perhaps you created a custom schema class and made a mistake. You’re stuck, right? Not so fast!

Create an LDIF file like the one below. Make sure to replace the schema class name.

dn: CN=badClass,CN=Schema,CN=Configuration,DC=X changetype: modify replace: isDefunct isDefunct: TRUE -

dn: CN=badClass,CN=Schema,CN=Configuration,DC=X changetype: modrdn newrdn: cn=badClassOld deleteoldrdn: 1

dn: changetype: modify add: schemaUpdateNow schemaUpdateNow: 1 -

Then- run the following command. Remember to use an account that has Schema Admin rights and run the command on the DC with the Schema Master role.

ldifde /i /f class.ldf /c "DC=X" "dc=domain,dc=com"

Now, go ahead and create the class the correct way.