↳ GitHub sourceAnalytics ruleMedium
Excessive number of failed connections from a single source (ASIM Network Session schema)
Description
'This rule identifies a single source that generates an excessive amount of failed connections. Modify the threshold to change the sensitivity of the rule: the higher the threshold, the less sensitive is the rule and less incidents will be generated.
This analytic rule uses [ASIM](https://aka.ms/AboutASIM) and supports any built-in or custom source that supports the ASIM NetworkSession schema'
- Rule type
- Scheduled
- Version
- 1.2.7
- Declared status
- Available
- Query frequency
- 1h
- Query period
- 1h
- Trigger
- gt 0
Declared MITRE coverage
Declared sources
Metadata from the source file. No dependencies inferred from KQL.
Connectors
Data types
KQL query
Original query, unchanged.
let threshold = 5000;
_Im_NetworkSession(eventresult='Failure')
| summarize Count=count() by SrcIpAddr, bin(TimeGenerated,5m)
| where Count > threshold
| extend timestamp = TimeGenerated, threshold
Declared entities
Related content
Links established from declared identifiers and solution manifests.
Source provenance
GitHubDisplayed values come from files in Azure/Azure-Sentinel. They describe the published template, not your workspace configuration.
- Commit
9800e51↗- Source identifier
4902eddb-34f7-44a8-ac94-8486366e9494
Additional source files 3
Solutions/Network Session Essentials/Analytic Rules/ExcessiveHTTPFailuresFromSource.yamlsource ↗Detections/ASimNetworkSession/ExcessiveHTTPFailuresFromSource.yamlmigration-note ↗Solutions/Network Session Essentials/Data/Solution_NetworkSessionEssentials.jsonsolution-membership ↗GSTEP / CATALOG TRACKING
Added to catalog : 16 Sept 2026 · 05:49 UTC
Last change observed : 16 Sept 2026 · 05:49 UTC