Module 3 of 8 — Incident Management

IT Support Incident Response Simulation

You are an IT Support Specialist at Meridian Technologies. A P1 incident has been escalated to your queue. Work through the investigation, apply your diagnostic knowledge, and demonstrate proper escalation procedures under realistic pressure.

Estimated time: 18–22 min

4 decision scenarios

Certification eligible

Role: L2 Support Analyst

Simulation Path

1

Introduction

Scenario briefing & context

~2 min

2

Incident Investigation

Analyze alerts & diagnostics

~6 min

3

Investigation Results

Review findings & feedback

~4 min

4

Escalation Decision

Choose response strategy

~5 min

5

Final Assessment

Performance scoring

~3 min

P1

Incident Severity

47

Users Affected

3

Active Alerts

92%

Avg. Cohort Score

Scenario Context Active Incident

It is Tuesday, 09:14 AM. You arrive at your workstation and notice a Priority 1 ticket has been auto-escalated from Tier 1 support. The incident involves a critical VPN infrastructure failure affecting the entire Engineering & Product department. Multiple upstream symptoms have been logged by the monitoring system since 08:47 AM.

Your goal is to investigate the root cause, select the appropriate diagnostic action, and escalate correctly before the 30-minute SLA window closes. Your responses will be evaluated on accuracy, speed, and communication clarity.

Step 2 of 5 — Incident Investigation

Analyze the Active Incident

INC-2024-08847 · Auto-escalated from T1

VPN Gateway Failure — Engineering Floor Network

P1 Critical SLA: 26 min remaining Network / VPN

Opened: 09:14 AM

Escalated: 09:17 AM

In Progress

Reporting Employee Verified User

SR

Sofia Reyes

Senior Product Engineer · Engineering

s.reyes@meridian.tech · ext. 4218

Hostname

MRD-ENG-0094

OS

macOS Sonoma 14.3

VPN Client

Cisco AnyConnect 4.10

Last Auth

Failed 09:12 AM

IP Address

10.48.22.107

MDM Status

Compliant

System Alerts 3 Active

VPN Gateway — AUTH_TIMEOUT_LOOP

RADIUS authentication server not responding. IKEv2 handshake failing at Phase 2. Packet loss: 94%

09:12 AM

Certificate Store — Expired Cert Detected

SHA-256 wildcard cert for *.vpn.meridian.tech expired 2024-01-08 00:00 UTC. TLS negotiation blocked.

09:09 AM

47 Concurrent Auth Failures — Engineering VLAN

Mass concurrent authentication failures detected across ENG-VLAN-12. Likely shared root cause.

09:14 AM

Event Log Live · Auto-refresh 30s

09:17

Ticket INC-2024-08847 auto-escalated from T1 → L2 Support queue (Sofia Reyes, ENG)

09:14

Mass auth failure alert triggered — 47 devices on ENG-VLAN-12

09:12

AUTH_TIMEOUT_LOOP on VPN Gateway GW-EAST-02 — RADIUS unreachable

09:09

Certificate expiry detected — *.vpn.meridian.tech (expired 09 Jan 2024)

08:47

VPN latency spike detected — GW-EAST-02 response time 4,200ms (threshold: 200ms)

Your Diagnostic Decision

Based on the alerts, device diagnostics, and event log above — what is the most likely root cause of the VPN authentication failures?

A

RADIUS Server Outage

The RADIUS authentication server is offline or unreachable. Reconfigure VPN gateway to fallback LDAP provider immediately.

B

Expired TLS Certificate

The wildcard VPN certificate expired, causing IKEv2 Phase 2 negotiation to fail. Renew and redeploy certificate via PKI infrastructure.

C

Network ACL Misconfiguration

A recent firewall change blocked UDP 500/4500 on ENG-VLAN-12. Roll back the last ACL policy push from maintenance window.

Diagnostic Context

Error Code IKE_AUTH_FAILED (13801)

Cert Expiry 2024-01-08 00:00 UTC

Last Cert Renewal 2023-01-08

RADIUS Ping Intermittent (timeout)

ACL Policy Change None in 14 days

Step 3 of 5 — Investigation Results

Diagnostic Findings Review

Root Cause Analysis Verified

1

Primary Cause: The wildcard certificate *.vpn.meridian.tech expired on January 8, 2024, exactly 365 days after issuance. No automated renewal alert was triggered due to a monitoring misconfiguration.

2

Cascading Effect: IKEv2 Phase 2 handshake cannot complete without a valid server certificate, causing all VPN authentication attempts to fail with error code AUTH_FAILED 13801. This rendered RADIUS unreachable as a downstream consequence.

3

Blast Radius: All 47 devices on ENG-VLAN-12 are simultaneously affected because they share the same VPN gateway endpoint (GW-EAST-02) and certificate trust chain. This confirms a shared infrastructure root cause, not individual device failures.

4

Misleading Signal: RADIUS intermittency and ACL absence correctly ruled out as primary causes. The 14-day ACL policy freeze was a strong negative indicator for firewall misconfiguration, and RADIUS ping failures were correlated with IKE timeout, not server downtime.

Impact Metrics

Users Affected

47

Engineering & Product

Incident Duration

27 min

↑ SLA threshold: 30 min

Auth Failures

1,340

Since 08:47 AM

Business Impact

High

Sprint blocked

Incident Timeline

08:47 AM

VPN Latency Spike

GW-EAST-02 response: 4,200ms. Certificate validation beginning to degrade.

09:09 AM

Certificate Expiry Triggered

Wildcard cert *.vpn.meridian.tech passed expiry timestamp. TLS negotiation hard-blocked.

09:12 AM

Mass Auth Failures Begin

First user reports. IKEv2 Phase 2 failing on all connections. RADIUS timeouts cascade.

09:14 AM

Alert Threshold Crossed

47 concurrent failures detected. P1 incident auto-declared. Ticket INC-2024-08847 created.

09:17 AM

L2 Escalation

Ticket escalated to you. Investigation begins.

09:24 AM

Root Cause Identified

You correctly identified expired certificate as primary cause. 7 min to diagnosis — within SLA.

Instructor Note

Certificate lifecycle management is responsible for ~18% of all enterprise VPN outages. Best practice: configure 60-day and 14-day expiry alerts in your PKI dashboard. Automate renewal where possible.

Step 4 of 5 — Escalation Decision Challenge

Determine Escalation Strategy

SEV-1 ACTIVE

Certificate Infrastructure Failure — Immediate Action Required

Root cause confirmed. 47 engineers offline. Sprint delivery at risk. PKI team notified pending your escalation decision.

08:42

SLA Window

Affected Systems

VPN Gateway GW-EAST-02

Critical

Cisco ASA 5525-X. All IKEv2 sessions failing. 0 active tunnels. Certificate store requires immediate update.

PKI / Certificate Authority

Degraded

Internal CA (DigiCert subordinate). Renewal queue backlogged — requires manual approval from PKI Admin. Estimated cert reissue: ~15 min.

RADIUS / NPS Server

Operational

Confirmed healthy. Timeouts were downstream of IKE failure. No action required on this system.

Select your escalation response: Choose the action that best resolves this incident within SLA

High Risk

A — Emergency P1 Bridge Call

Immediately convene a war room with VPN team, PKI admin, networking, and management. Pause all other work until resolved.

~35 min resolution Overkill for root cause Exceeds SLA

Recommended

B — Direct Escalation to PKI Admin

Escalate directly to PKI Infrastructure Admin with full diagnostic report. Request emergency certificate renewal and gateway push. Notify Engineering manager via Slack.

~15 min resolution Correct scope Within SLA

Risky

C — Roll Back VPN Gateway Config

Revert GW-EAST-02 to the last known-good configuration snapshot from 48 hours ago as a temporary workaround while PKI processes the renewal.

~20 min for rollback Doesn't fix cert Risk of data loss

Incomplete

D — Document & Update Ticket Only

Add detailed RCA notes to the ticket and update the status to "Investigating". Await further instructions from senior engineer before taking action.

No resolution SLA breach Passive response

Simulation Completed Successfully

You have successfully resolved the VPN infrastructure incident and demonstrated proficient L2 support competency across all evaluation criteria.

Troubleshooting Score

80%

Accurate root cause identification using systematic elimination of false positives

Escalation Handling

88%

Appropriate scope escalation directly to accountable team within SLA window

Communication Clarity

95%

Clear, structured incident communication with supporting technical evidence

Performance Summary Passed

87%

Overall Score

7min

Time to Diagnosis

2/2

Correct Decisions

SLAMet

Compliance

IT Support Incident Response — L2 Certification

Awarded by PulseDesk Academy · Meridian Technologies Internal Training Program

Completed in 19 min

2 CPD credits

Score: 87% — Proficient

Learner: J. Richardson

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