All Errors

npm fails with code EAI_AGAIN when it can't resolve registry.npmjs.org via DNS. It's usually a transient or misconfigured DNS issue you fix by testing resolution and switching DNS servers.

The SSH server reset the connection during key exchange. Fix by checking firewall/fail2ban, MaxStartups, or port 443 SSH.

"No module named 'pkg_resources'" means setuptools (which provides pkg_resources) is missing from your environment. Fix it with pip install --upgrade setuptools.

This error occurs when Docker Desktop on Windows cannot start because the WSL 2 Linux kernel is outdated. The fix is straightforward: update WSL using the command line or download the kernel update manually from Microsoft.

Fix Git's "destination path already exists and is not an empty directory" clone error by removing or renaming the existing folder, or cloning into a new path.

SSH prints this when the server declines to allocate a pseudo-terminal for an interactive session. The usual cause is a restricted key or sshd policy that forbids a TTY, not a broken server.

GitHub blocks requests past the hourly cap (60 unauthenticated, 5000 authenticated). Fix by sending a token via the Authorization header and honoring Retry-After.

The "repository is not signed" error occurs when APT cannot authenticate packages from a third-party repository because it lacks the required GPG public key. Fix it by importing the missing GPG key or trusting the repository.

The 'dial tcp: i/o timeout' error occurs when Docker cannot establish a network connection within the expected time. This typically indicates DNS resolution problems, network connectivity issues, firewall restrictions, or proxy misconfiguration.

MySQL Error 1064 (ER_PARSE_ERROR) occurs when the database parser encounters invalid SQL syntax. Common causes include misspelled keywords, unescaped reserved words, mismatched quotes or parentheses, missing data values, and outdated syntax. Fixing requires careful review of the query, using backticks for reserved words, and validating syntax with tools.

This error occurs when the apt package manager cannot find a package in your configured repositories. The package may have a typo, your package cache may be outdated, or required repositories may be disabled on your system.

MySQL ERROR 2026 (HY000) is a generic SSL/TLS handshake failure that happens before authentication. In modern setups the most common cause is a TLS version mismatch (old clients negotiating TLSv1.0/1.1, which MySQL removed in 8.0.28), followed by untrusted or self-signed CA certificates. Diagnose it with a single openssl s_client probe, then either trust the CA, skip certificate verification while keeping encryption, or upgrade the client's TLS support.

This Vite error occurs when the bundler cannot locate an imported module, typically due to incorrect paths, missing dependencies, or misconfigured path aliases.

The 'net/http: TLS handshake timeout' error occurs when Docker cannot complete a TLS handshake with a registry within the allowed time. It is usually caused by MTU mismatches, proxy misconfiguration, firewall/VPN packet inspection, or network latency rather than the registry being down.

PostgreSQL password authentication failures occur when credentials are incorrect, misconfigured, or the authentication method is incompatible. Verify your password, connection string, and pg_hba.conf settings to resolve.

PuTTY's "Server unexpectedly closed network connection" most often means sshd dropped you at connection setup (fail2ban ban, MaxStartups, TCP wrappers, cipher/kex mismatch); idle timeouts are a less common cause.

This error appears on Apple Silicon Macs when Docker Desktop needs Rosetta 2 for x86/amd64 emulation. Install Rosetta 2 via Terminal or enable the Rosetta setting in Docker Desktop to run Intel-based containers on M1/M2/M3 Macs.

The SSH "no hostkey alg" error occurs when the SSH client and server cannot agree on a compatible host key algorithm. This typically happens when newer clients connect to old servers whose only host key uses the deprecated ssh-rsa (SHA-1) algorithm.

This Azure DevOps error occurs when you try to push directly to a branch that has branch policies enabled. The branch requires changes to go through pull requests rather than direct commits.

This error occurs when Firebase Cloud Messaging rejects a registration token because it is invalid, expired, unregistered, or no longer recognized by FCM. The fix involves validating tokens, removing stale tokens, refreshing tokens on the client side, and implementing proper token lifecycle management.