firewall logs are not working. I can't make any query

Hi,
Sorry for late response, it was a couple crazy day at work for me.
This query bellow it's one of the example. It's working in another firewall with any issues.
Thank you

// Application rule log data
// Parses the application rule log data.
AzureDiagnostics
| where Category == "AzureFirewallApplicationRule"
//this first parse statement is valid for all entries as they all start with this format
| parse msg_s with Protocol " request from " SourceIP ":" SourcePort:int *
//Parse action as this is the same for all log lines
| parse kind=regex flags=U msg_s with * ". Action\: " Action "\."
// case1: Action: A. Reason: R.
| parse kind=regex flags=U msg_s with "\. Reason\: " Reason "\."
//case 2a: to FQDN:PORT Url: U. Action: A. Policy: P. Rule Collection Group: RCG. Rule Collection: RC. Rule: R.
| parse msg_s with * "to " FQDN ":" TargetPort:int * "." *
//Parse policy if present
| parse msg_s with * ". Policy: " Policy ". Rule Collection Group: " RuleCollectionGroup "." *
| parse msg_s with * " Rule Collection: " RuleCollection ". Rule: " Rule
//case 2.b: Web Category: WC.
| parse Rule with * ". Web Category: " WebCategory
//case 3: No rule matched. Proceeding with default action"
| extend DefaultRule = iff(msg_s contains "No rule matched. Proceeding with default action", true, false)
| extend
SourcePort = tostring(SourcePort),
TargetPort = tostring(TargetPort)
| extend
Action = case(Action == "","N/A", case(DefaultRule, "Deny" ,Action)),
FQDN = case(FQDN == "", "N/A", FQDN),
TargetPort = case(TargetPort == "", "N/A", tostring(TargetPort)),
Policy = case(RuleCollection contains ":", split(RuleCollection, ":")[0] ,case(Policy == "", "N/A", Policy)),
RuleCollectionGroup = case(RuleCollection contains ":", split(RuleCollection, ":")[1], case(RuleCollectionGroup == "", "N/A", RuleCollectionGroup)),
RuleCollection = case(RuleCollection contains ":", split(RuleCollection, ":")[2], case(RuleCollection == "", "N/A", RuleCollection)),
WebCategory = case(WebCategory == "", "N/A", WebCategory),
Rule = case(Rule == "" , "N/A", case(WebCategory == "N/A", Rule, split(Rule, '.')[0])),
Reason = case(Reason == "", case(DefaultRule, "No rule matched - default action", "N/A"), Reason )
| project TimeGenerated, msg_s, Protocol, SourceIP, SourcePort, FQDN, TargetPort, Action, Policy, RuleCollectionGroup, RuleCollection, Rule, Reason ,WebCategory

Hi @Pawel Wilusz ,

Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.
I understand that you are facing issues in Azure Firewall Logs.

From the error message, it appears that Azure is unable to parse "msg_s" in Azure Firewall Logs query

Can you please enable the features, AFWEnableNetworkRuleNameLogging and AFWEnableStructuredLogs following this document

Post this, kindly do a Put operation on your firewall, like adding a dummy rule and deleting it.

Give it a few hours and try to run the query once again.
Let me know if this helps.

Thanks,
Kapil

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