Practical IT troubleshooting
Understand the error.
Fix the right layer.
Paste the diagnostic output already in front of you. Get a plain-English explanation, focused checks, and the next useful command.
No signup. No upload. The analyzers run entirely in your browser.
Five focused tools
Start with the problem you have
What Does This dig Output Mean?
Paste dig output to understand the response status, flags, answer sections, recursion behavior, and the next useful check.
LinuxWhy Did My systemd Service Fail?
Paste systemctl status or journal output to identify execution, identity, path, permission, and restart-loop failures.
ContainersWhy Won't My Docker Container Start?
Paste a Docker or Compose error to distinguish entrypoint, architecture, mount, port, resource, and daemon problems.
Web and TLSWhy Is cURL Failing This HTTPS Request?
Paste verbose cURL output to separate DNS, TCP, proxy, certificate, TLS handshake, timeout, and server-response failures.
Remote accessWhy Is My SSH Connection Failing?
Paste ssh -vvv output to locate the failure across name resolution, transport, key exchange, host verification, and authentication.
Problem-first guides
The exact errors people search for
Each guide explains one specific failure in depth, then links to the tool that can analyze the reader's own output.
Browse every guide →dig Warning: Recursion Requested but Not Available
Understand why dig prints the recursion warning, when it is expected, and how the aa, rd, and ra flags change the diagnosis.
Linuxsystemd status=203/EXEC: Causes and Fixes
Work through the executable path, permissions, interpreter, line endings, service identity, and security controls behind status 203/EXEC.
ContainersDocker OCI Runtime Exec Format Error: Causes and Fixes
Separate CPU architecture mismatches from broken entrypoint scripts, shebang problems, and Windows line endings.
Web and TLScURL Error 35: SSL_ERROR_SYSCALL Explained
Use verbose output and independent TLS tests to identify resets, proxies, protocol mismatches, and unexpected peer closure.
Remote accessSSH Connection Closed by UNKNOWN Port 65535
Trace the misleading port 65535 message through ProxyJump, ProxyCommand, bastion, forwarding, and middlebox failures.
A simple workflow
From output to a useful next step
Paste the relevant output
Use a complete status, error, or verbose trace with secrets removed.
Find the failed stage
The analyzer separates symptoms from the first likely blocker.
Verify before changing
Run focused checks and make the smallest correction supported by evidence.