All Errors

MySQL ERROR 1045 occurs when authentication fails during login. This happens when the username and password don't match, the user doesn't exist, or the host isn't allowed. The error appears immediately when connecting to MySQL and prevents database access until credentials are corrected.

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.

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include misspelled keywords, unescaped reserved words, mismatched quotes or parentheses, missing data values, and outdated syntax.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 Docker daemon fails to start on Linux systems using systemd. Common causes include disk space issues, invalid daemon.json configuration, firewall conflicts, or missing dependencies like iptables. Check journalctl logs for the specific cause.

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.

SSH authenticated you, but the server could not start your login shell. It usually means the user's shell is missing or invalid, the home directory or shell binary has bad permissions, the disk is full or read-only, or a security/PAM policy blocked the session.

This error occurs when PostgreSQL receives a connection attempt but cannot find a matching rule in the pg_hba.conf configuration file. It typically happens when connecting from an IP address, hostname, or with a user/database combination that isn't explicitly allowed. Add the missing entry to pg_hba.conf and reload the database to fix it.

Git can't verify the remote's SSL/TLS certificate because the signing Certificate Authority isn't in your trust store. Common in corporate proxy networks, with self-signed certs, or outdated CA bundles.

The 'pull access denied, repository does not exist or may require authentication' error occurs when Docker cannot locate or access an image from the registry. This is commonly caused by typos in the image name, missing authentication for private repositories, or referencing images that don't exist.

This error appears when Docker Desktop cannot find WSL 2 (Windows Subsystem for Linux 2) on your Windows system. Docker Desktop requires WSL 2 as its backend to run Linux containers on Windows 10/11, and this message indicates the required Windows features are not enabled or properly configured.

The 'version is obsolete' warning appears when running Docker Compose V2 with a docker-compose.yml file that includes the deprecated `version:` field. This is a harmless warning that can be resolved by simply removing the version line from your Compose file.

This error occurs when Git fails to receive or process pack data during clone, fetch, or pull operations. It typically indicates a network interruption, insufficient memory, or issues with the data stream between the Git client and remote server.

The 'RPC failed; curl 56 GnuTLS' error occurs during Git operations over HTTPS when there's a TLS/SSL communication failure. This is commonly caused by network issues, large repository transfers, or GnuTLS library problems on Linux systems.

Connection closed by UNKNOWN port 65535 is a SERVER-SIDE sshd log line, not a client error. It almost always means harmless internet scanner noise or a TCP load balancer health check hitting port 22 and dropping before the banner.

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.

This MySQL authentication error (1045) occurs when connection credentials are rejected during the authentication phase. The error indicates MySQL received the password but rejected it due to authentication method mismatch, incorrect password, wrong user account, socket authentication plugin, or permissions issue. Common on fresh installations with auth_socket authentication or when password authentication is not properly configured.

This error occurs when a container that another service depends on fails its health check and is marked as 'unhealthy'. Docker Compose stops waiting and prevents the dependent service from starting, requiring you to fix the unhealthy dependency or adjust health check timing.

This error occurs when a MySQL query references a column name that doesn't exist in the table or isn't accessible in the current query context. It's one of the most common SQL errors and usually results from typos, missing quotes around string values, or incorrect table aliases.

The 'terminal prompts disabled' error occurs when Git needs to prompt for credentials but runs in a non-interactive environment. This commonly happens in CI/CD pipelines, scripts, or automated processes where there's no terminal to receive user input.

Fix Git push rejected by "pre-receive hook declined" - protected branch, missing permissions, or commit policy. How to find the rule and push.