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SIGNAL ONLINE

Make complex systems run clearly.

From a single phone to a full server, I work through the real problems between devices, systems, networks and services.

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Sound-free experience

ONE CONNECTED PRACTICE

A complete technical view across endpoints, networks and servers.

I focus on how systems connect, not only on individual commands. Problems often live at the boundary between a device, a protocol, a service and its configuration. Reliable answers come from seeing both upstream and downstream.

EXPERTISE / 06 DOMAINS

Expertise map

Six domains, one working method: understand the environment, control risk, verify outcomes and preserve a rollback path.

Endpoints & operating systems

Device setup, OS installation, migration, recovery and virtualized environments.

Phones & computers
Windows
macOS
Linux
OS installation
Virtual machines

Networks & connectivity

From local network hardware to public reachability and encrypted links.

Enterprise routers
Switches
IPv4 / IPv6
DDNS
Tunneling
DNS / SSL

Servers & services

Practical service deployment and foundational maintenance.

Nginx
Apache
MySQL
Docker
NAS
Cloud / on-premise

Operations & remote access

Tracing common software and hardware faults through symptoms, logs and links.

SSH
Telnet
FTP
Sunlogin
ToDesk
Troubleshooting

AI & automation

Connecting models, agents and existing tools into useful workflows.

AI agents
OpenClaw
Hermes
Vibe Coding
Local models
API integration

Development & products

Understanding the full stack and moving an idea toward an accessible product.

Frontend
Backend
Web development
App development
Deployment
Fast learning

REMOTE / SERVICE LAYERS

Remote technical services

We first confirm the environment, desired outcome and safe operating scope. All work is remote.

System installation & setup

Operating systems, virtual machines, software environments, migrations and foundational recovery.

Networks & domains

Routing and switching, IPv4 / IPv6, DDNS, tunnels, DNS and SSL deployment.

Server deployment

Web services, databases, Docker, NAS, cloud or on-premise server configuration.

Troubleshooting & maintenance

Diagnosing symptoms through logs and network paths, then verifying the result and documenting maintenance.

AI & development integration

Local models, AI agents, API integrations and focused web or lightweight app implementation.

FIELD NOTES

Technical notes that go beyond the command.

Each note aims to preserve the environment, problem, operation, validation and rollback—so it remains useful even as versions change.

01 Servers & networking · 2026-07-22 · 3 min read From DNS to HTTPS: Deploying a Verifiable Nginx Site on Ubuntu 24.04 Connect DNS, IPv4/IPv6, Nginx, TLS and external validation across one complete request path—and preserve a clear rollback when a layer fails. NginxUbuntuDNSIPv6SSL

02 Operations · 2026-07-18 · 3 min read When a Service Won't Open, Don't Reinstall Yet Timeouts, refused connections, TLS errors and gateway failures indicate different breakpoints. Follow one repeatable path from client and DNS to proxy and application. TroubleshootingNetworkingNginxLinux

03 AI & development · 2026-07-12 · 3 min read Local Model, API, or Agent: Six Decisions Before Building an AI Workflow Start AI architecture with the task, data, hardware, permissions, failure modes and maintenance—not with a model name. AI AgentLocal LLMAPIAutomation

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ABOUT YAANG

Find the real problem between a device, a network and a service.

I'm Yaang. My hands-on work spans phones, computers, servers and network equipment, while I continue exploring how AI and development can improve practical workflows.

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REMOTE / AVAILABLE

Have something that needs to be installed, connected or made stable?

When adding me on WeChat, briefly mention the device, system or service involved. We will confirm whether the task can be completed remotely before starting.

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