Linux & administration

Total: 71

Fixing session_start(): No Such File or Directory Error in PHP

Different from Permission Denied: this says the directory configured in session.save_path *doesn't exist at all*. Walk through finding the configured path, recreating it with correct ownership, the multi-distro default paths that silently disappear after OS upgrade, and the .user.ini override pattern.

Published: 30.03.2026

Fixing PHP session_start(): Permission Denied (13) Error

Comprehensive single-page reference for session_start permission denied — the "if you only read one article" version. Walk through finding session.save_path, the per-SAPI permission audit, SELinux/AppArmor relabel, disk-space angle, multi-PHP-user pool ownership issues, and restart+test verification flow.

Published: 20.12.2025

Fixing phpMyAdmin "Error During Session Start" — Complete Guide

phpMyAdmin's "Error during session start" is a PHP session_start failure shown through its UI. Walk through the four common root causes — write permission on session.save_path, broken php.ini config, full disk, SELinux/AppArmor blocking — and the phpMyAdmin-specific config (`$cfg['SessionSavePath']` override).

Published: 04.07.2025

Using method 'mysql_native_password' failed with message: access denied for user

When the client explicitly negotiates `mysql_native_password` but the server refuses ("access denied"), the cause is one of: the user account is actually on `caching_sha2_password`, the password was changed but client cached the old, the user only has grants from a different host, or required TLS isn't in use. Walk through diagnosing which.

Published: 29.05.2026

Fixing ZipArchive::close(): Can't Open File — Permission Denied in PHP

ZipArchive::close() writes the final archive to disk; permission denied means PHP can't create the output file. Walk through verifying the target directory is writable by PHP's user, the temp-dir for ZipArchive's scratch space, SELinux/AppArmor relabel for custom upload paths, and the disk-space check (zip creation needs ~2x file size temporarily).

Published: 07.02.2026

Fixing "ssh_init: host does not exist" — Flush DNS Cache

When SSH/SFTP clients return "ssh_init: host does not exist" but `nslookup` from the same machine resolves correctly, your OS-level DNS cache is stale. Walk through flushing on Windows (`ipconfig /flushdns`), macOS (`dscacheutil`, `killall mDNSResponder`), Linux distros (`resolvectl flush-caches`, `nscd -i hosts`), and restarting the network stack as a last resort.

Published: 04.09.2025

How to Use portquiz.net to Test Port 8080

portquiz.net is the canonical "is port N open outbound?" test — a free service that listens on every TCP port and replies with simple text. Walk through browser-based and curl-based tests, distinguishing outbound (your network can reach the port) from inbound (someone else can reach yours), and using it to diagnose corporate firewall rules.

Published: 16.01.2026

How to Use Port 8080 on a VPS: Complete Configuration Guide

Running a service on port 8080 on a VPS requires: app bound to 8080, firewall (UFW/iptables/CSF) accepting inbound, optionally port-forwarding 80 → 8080 if you want the user-facing URL clean. Walk through each layer, verifying with `ss`/`netstat` and external port-check tools, and the common apps (Tomcat, Jenkins, Node.js dev servers) that default to 8080.

Published: 23.09.2025

Fix "ssh_init: host not found" Error in SSH

Sibling guide focused on the "host not found" variant — same root causes as "host does not exist" but the error wording shifts by SSH client version and underlying library. Walk through the diagnostic order, including a check specific to PuTTY/Bitvise on Windows where the wording is often "Server unexpectedly closed network connection."

Published: 15.03.2026

Fixing MySqlException (0x80004005) by Updating MySQL Connector or Client

When 0x80004005 traces back to client-library incompatibility — old library + new server's auth plugin, old library + new TLS requirements — the fix is updating the connector. Walk through per-language version updates (.NET NuGet, Python pip mysqlclient, Node.js npm mysql/mysql2, PHP-MySQLextension), the breaking-changes to expect, and the cross-stack verification.

Published: 14.10.2025

Fixing MySQL Error 0x80004005 Due to Corrupt Database Files

When 0x80004005 traces back to "table is marked as crashed" or InnoDB "corruption page" messages, the underlying data files are broken. Walk through diagnosing with `CHECK TABLE`, InnoDB recovery mode (`innodb_force_recovery` levels 1-6), MyISAM repair with `myisamchk`, when restoring from backup is the only safe path, and prevention via proper shutdown + redundant storage.

Published: 17.03.2026

Fixing session_start(): Permission Denied (13) — Failed to Read Session Data in PHP

Comprehensive guide focused on the "failed to read session data" variant — session.save_path exists and is writable, but PHP can't read what's in it. Walk through ownership-vs-mode confusion, mode 700 vs 770 implications, multi-user session dirs, SELinux/AppArmor context interactions, and the session-file cleanup that frees stuck reads.

Published: 09.06.2025

Fixing session_start(): Permission Denied (13) — Verify PHP Configuration (php.ini)

Sibling guide focused on the php.ini-side fix for session_start permission denied. Walk through finding the right php.ini, the session-specific directives (session.save_path, session.save_handler, session.gc_*), restart and verify, and the per-user .user.ini override pattern for multi-tenant servers.

Published: 01.10.2025

Fixing MySqlConnector.MySqlException (0x80004005): Access Denied for User

When a .NET application using MySqlConnector throws 0x80004005 "Access denied," the cause is MySQL-side authentication failure. Walk through verifying credentials, the bind-address (0.0.0.0 vs 127.0.0.1) limits, caching_sha2_password vs native_password compatibility, MySqlConnector version and TLS requirements, and the firewall layer.

Published: 15.01.2026

Fixing session_start(): Permission Denied (13) in XAMPP — SELinux/AppArmor Restrictions

Linux XAMPP installs on SELinux-enforcing distros (Fedora, RHEL) often fail session_start because the XAMPP tmp dir doesn't have the right SELinux context, or AppArmor (on Ubuntu derivatives) restricts httpd's file access. Walk through diagnosing with `audit2why` / `aa-status`, the proper fixes (chcon for SELinux, aa-complain for AppArmor), and when temporarily disabling is acceptable.

Published: 09.03.2025

Fixing session_start(): Permission Denied (13) in XAMPP — System Administrator's Guide

XAMPP on Windows/macOS/Linux ships with its own session save path (`xampp/tmp` or `/opt/lampp/tmp`) — when that directory has wrong permissions or doesn't exist, session_start fails. Walk through finding XAMPP's configured path, recreating the dir with correct ownership for the XAMPP user, and per-OS permission quirks.

Published: 25.12.2025

Fixing session_start(): No Such File or Directory Error in PHP

Fixing PHP session_start(): Permission Denied (13) Error

Fixing phpMyAdmin "Error During Session Start" — Complete Guide

Using method 'mysql_native_password' failed with message: access denied for user

Fixing ZipArchive::close(): Can't Open File — Permission Denied in PHP

Fixing "ssh_init: host does not exist" — Flush DNS Cache

How to Use portquiz.net to Test Port 8080

How to Use Port 8080 on a VPS: Complete Configuration Guide

Fix "ssh_init: host not found" Error in SSH

Fixing MySqlException (0x80004005) by Updating MySQL Connector or Client

Fixing MySQL Error 0x80004005 Due to Corrupt Database Files

Fixing session_start(): Permission Denied (13) — Failed to Read Session Data in PHP

Fixing session_start(): Permission Denied (13) — Verify PHP Configuration (php.ini)

Fixing MySqlConnector.MySqlException (0x80004005): Access Denied for User

Fixing session_start(): Permission Denied (13) in XAMPP — SELinux/AppArmor Restrictions

Fixing session_start(): Permission Denied (13) in XAMPP — System Administrator's Guide

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Fixing session_start(): No Such File or Directory Error in PHP

Fixing PHP session_start(): Permission Denied (13) Error

Fixing phpMyAdmin "Error During Session Start" — Complete Guide

Using method 'mysql_native_password' failed with message: access denied for user

Fixing ZipArchive::close(): Can't Open File — Permission Denied in PHP

Fixing "ssh_init: host does not exist" — Flush DNS Cache

How to Use portquiz.net to Test Port 8080

How to Use Port 8080 on a VPS: Complete Configuration Guide

Fix "ssh_init: host not found" Error in SSH

Fixing MySqlException (0x80004005) by Updating MySQL Connector or Client

Fixing MySQL Error 0x80004005 Due to Corrupt Database Files

Fixing session_start(): Permission Denied (13) — Failed to Read Session Data in PHP

Fixing session_start(): Permission Denied (13) — Verify PHP Configuration (php.ini)

Fixing MySqlConnector.MySqlException (0x80004005): Access Denied for User

Fixing session_start(): Permission Denied (13) in XAMPP — SELinux/AppArmor Restrictions

Fixing session_start(): Permission Denied (13) in XAMPP — System Administrator's Guide

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