About Me
Damon
Senior Technical Support Engineer · OPSWAT
Ho Chi Minh City, Vietnam
I'm a Senior Technical Support Engineer at OPSWAT, with over 7 years of experience in Linux systems, infrastructure engineering, and production troubleshooting.
My career started at Vietnix, an Anti-DDoS hosting provider, where I managed server fleets, tuned NGINX configurations, and handled network-level incidents under high traffic conditions.
At OPSWAT, I work at Level 3 technical support, focusing on enterprise-grade cybersecurity solutions — MetaDefender Core and Secure Storage. My role involves diagnosing OS-level issues, debugging complex network configurations, and solving production problems in large-scale, high-availability environments.
What This Blog Is About
Infrastructure troubleshooting, Linux systems, networking behavior, and production debugging.
The content is based on real-world scenarios — not documentation summaries, not toy examples. Things I have personally debugged, investigated, and resolved.
- ▸NGINX 502 bad gateway errors and upstream failures
- ▸Linux connection issues — TIME_WAIT exhaustion, ephemeral port limits
- ▸Keepalive misconfiguration and connection handling problems
- ▸Docker container networking and log management
- ▸Debugging systems under production load
- ▸Security operations in enterprise environments
Not theory — real incidents, documented and explained.
Why This Blog Exists
Most technical content explains what something is. This blog focuses on:
- ▸why systems break
- ▸how to debug them
- ▸how to fix them in production
Every article comes from something I have personally encountered — a real issue, a deep investigation, or a problem that required understanding beyond the documentation. If it took time to figure out, it's worth documenting.
Who This Is For
Engineers who:
- ▸work with Linux systems
- ▸debug production issues
- ▸manage infrastructure or backend systems
- ▸deal with NGINX, Docker, or Kubernetes
- ▸want practical, real-world troubleshooting knowledge
Skills & Stack
Infrastructure
- ▸NGINX
- ▸Docker
- ▸Kubernetes
- ▸Linux Administration
- ▸Load Balancing
Security
- ▸Endpoint Security
- ▸Threat Analysis
- ▸SSL/TLS Hardening
- ▸Firewall Rules
- ▸Log Correlation
Debugging
- ▸Production Incidents
- ▸Root Cause Analysis
- ▸TCP/Network Tracing
- ▸Performance Profiling
- ▸Packet Capture
Observability
- ▸Log Aggregation
- ▸ELK Stack
- ▸Metrics & Alerting
- ▸Dashboards
- ▸sysctl Tuning
Experience
Senior Technical Support Engineer
OPSWAT
Leading deep-dive troubleshooting on MetaDefender Core and Secure Storage for enterprise customers globally. Focus on OS performance tuning, complex deployment issues, and escalation engineering.
Technical Support Engineer
OPSWAT
Level 3 technical support for OPSWAT MetaDefender Core and Secure Storage across global enterprise accounts. Advanced Linux system debugging, network configuration, Python scripting, and cross-platform deployments.
System Administrator / Linux System Engineer
Vietnix — Anti DDoS Server
Managed Linux server infrastructure for a DDoS mitigation provider. Server fleet operations, NGINX configuration, network performance tuning, and on-call incident response under high traffic conditions.
If you're dealing with NGINX errors, connection failures, container networking issues, or debugging production systems under load — you'll likely find something useful here.