Issue is seen during preview configuration of firewall policy on Security Director to 23.1 (patch v4) and Security Director Insights to 23.1 (patch v1) It fails with the error "com.fasterxml.jackson.databind.JsonMappingException: argument "content" is null (through reference chain: net.juniper.jnap.sm.dcpolicymanager.DCPolicyMO["ruleGroups"]->java.util.ArrayList[0]->net.juniper.jnap.sm.dcpolicymanager.DCRuleMO["hitCountDetails"])"
Preview Configuration Changes of Firewall policy fails with "com.fasterxml.jackson.databind.JsonMappingException: argument "content" is null (through reference chain: net.juniper.jnap.sm.dcpolicymanager.DCPolicyMO["ruleGroups"]->java.util.ArrayList[0]->net.juniper.jnap.sm.dcpolicymanager.DCRuleMO["hitCountDetails"])"
This is a known issue in Security Director 23.1 Hotpatch V4.
The fix for this issue is available in Security Director 23.1 Hotpatch V5. The download link for the Hotpatch is SD 23.1 HPv5.
The installation instructions for the hotpatch are available at Installation Instructions.