Muhammed Zanhal

IT Support Engineer in Dubai | UAE

Case Studies

A few problems worth
writing up

CASE 01

Resolving persistent Active Directory account lockouts

Investigation

Traced repeated lockouts on a high-priority account using AD Event ID 4740, source IP identification and Credential Manager analysis.

Root cause

Outdated credentials stored in an old mobile mail profile, combined with cached background services.

Result: recurring lockouts eliminated
CASE 02

Resolving network IP conflicts

Investigation

ARP and MAC address analysis cross-referenced against Active Directory and DHCP/DNS reservations.

Root cause

Two systems configured with the same manually assigned static IP address.

Result: network stability restored
CASE 03

Critical server hardware recovery

Investigation

A company server failed to POST; diagnostics pointed to BIOS configuration and hardware faults.

Root cause

A depleted CR2032 CMOS battery.

Result: portal restored, no motherboard replacement needed
CASE 04

Diagnosing a network printer failure

Investigation

Printer appeared online but the queue stayed paused; the investigation moved to the authentication layer.

Root cause

An expired Active Directory password affecting authentication to the network printer share.

Result: printing restored after credential reset

These IT support case studies document troubleshooting problems investigated by Muhammed Zanhal, an IT Support Engineer based in Dubai, United Arab Emirates. The cases cover Active Directory, network troubleshooting, server hardware recovery, and IT infrastructure support.