A Safe Troubleshooting Workflow Before Changing Anything Effective troubleshooting starts by preserving the current state, reproducing the symptom, and... How to Isolate a Browser, DNS, Server, or Website Problem A website request passes through several layers, so the same symptom can have very different... What to Record Before Troubleshooting a Website Error Error details are most useful when they capture the exact failing request rather than a general... Diagnosing a Website That Loads for Some People but Not Others If a website works for some visitors but not others, first determine whether the difference... Diagnosing Website Changes That Do Not Appear When an edit is saved but the public page still shows the old version, caching or editing the... A First-Pass Checklist for a Slow Website Slow pages can be caused by application work, database queries, remote services, resource... How to Verify a Fix Without Causing a Second Problem A troubleshooting change is not complete until the original symptom is retested and temporary... What Account Information the cPanel AI Assistant Can Read cPanel documents several read-only account details that the AI Assistant can use when diagnosing... Diagnosing an HTTP 403 Forbidden Error An HTTP 403 response means the server understood the request but refuses to fulfill it. On a... Why Correct DNS Matters for AutoSSL SSL issuance and DNS are closely related. AutoSSL can only validate hostnames that meet the... Diagnosing an HTTP 404 Not Found Error An HTTP 404 response means the requested resource was not found, or the server is not willing to... Troubleshooting Common AutoSSL Failures AutoSSL failures are usually more useful when treated as validation errors rather than generic... Diagnosing an HTTP 500 Internal Server Error An HTTP 500 response indicates that the server encountered an unexpected condition that prevented... Diagnosing an HTTP 502 Bad Gateway Error An HTTP 502 response means a server acting as a gateway or proxy received an invalid response... Diagnosing an HTTP 503 Service Unavailable Error An HTTP 503 response indicates that the server is temporarily unable to handle the request,... Diagnosing an HTTP 504 Gateway Timeout Error An HTTP 504 response means a gateway or proxy did not receive a timely response from an upstream... Diagnosing a Too Many Redirects or Redirect Loop Error A redirect loop occurs when redirects send the browser between URLs without reaching a final... Why Nova May Not Appear in cPanel Nova is not guaranteed to appear on every cPanel account, even when the server supports... Diagnosing a Blank or Partially Loaded Web Page A blank or incomplete page often means the request started but failed before the application... Diagnosing Missing CSS, JavaScript, or Images If the HTML page loads but styling, scripts, or images do not, inspect the failed asset requests... Diagnosing Website File Permission Errors Linux permissions control which users and processes can read, write, or execute files and... Diagnosing a Website That Is Serving Files From the Wrong Directory If edits do not appear or a domain shows another site’s content, verify the domain’s document... Diagnosing PHP Upload Failures and Size Limits PHP uploads are constrained by several settings. The effective upload limit can be lower than... How to Trace Email with Track Delivery Track Delivery shows delivery reports for mail processed by the cPanel account and is one of the... What to Do When cPanel Reports Disk Quota Exceeded A disk quota exceeded condition means the hosting account has reached its allowed storage limit.... Diagnosing a PHP Memory Exhausted Error A PHP “Allowed memory size … exhausted” error means the script attempted to allocate more memory... Diagnosing a PHP Maximum Execution Time Error A maximum execution time error occurs when a PHP request exceeds its configured execution-time... How to View WP Toolkit Logs WP Toolkit keeps activity logs for managed WordPress installations. Logs can help explain why a... Diagnosing a PHP Version Compatibility Problem Applications, plugins, and themes can require a minimum PHP version or fail on a version they do... Diagnosing a Cron Command That Works Manually but Not on Schedule A command can work in an interactive shell but fail under cron because cron runs with a different... Diagnosing Disk Space Problems That Break Website Operations An account near or over quota can fail in ways that do not look like a simple “disk full”... Diagnosing an Application That Cannot Create or Modify Files If an application cannot create cache files, uploads, updates, or generated assets, check both... Troubleshooting an Expired SSL Certificate An expired certificate is no longer within its valid date range and browsers can warn visitors... Troubleshooting FTP Login and Upload Problems When an FTP connection fails, verify the connection details before changing server files. Confirm... Diagnosing Large Imports That Fail in the Browser Large imports can hit several independent limits: browser/proxy timeouts, PHP upload size, POST... Troubleshooting an SSL Hostname Mismatch A hostname mismatch occurs when the requested hostname is not included in the certificate... Reading Resource Faults During Troubleshooting On CloudLinux systems, Resource Usage can show limits and faults for resources such as CPU, entry... Troubleshooting an Untrusted SSL Certificate Warning A browser can reject a certificate even when encryption is technically active. Common causes... Troubleshooting Email That Will Not Send or Receive Use a structured check before changing multiple email settings at once. If you cannot send Sign... Diagnosing a Database “Access Denied” Error A MySQL or MariaDB “Access denied” error usually means the connection credentials or privileges... WP Toolkit Troubleshooting FAQ My WordPress site does not appear in WP Toolkit Run Scan from WP Toolkit. If the site still is... Diagnosing a Database “Too Many Connections” Error MySQL returns “Too many connections” when all ordinary client connection slots are in use. The... Diagnosing “MySQL Server Has Gone Away” “MySQL server has gone away” can occur when a connection is closed after a timeout, when a client... Troubleshooting Missing cPanel AI and Site-Creation Features When a documented AI or site-creation option is missing, first determine whether the feature is... Diagnosing Database Packet Too Large Errors MySQL rejects a communication packet that exceeds the active max_allowed_packet limit and can... Why a Browser Can Show the Wrong Server Certificate If DNS points a hostname to a different server, the browser can receive that other server's... Diagnosing Symptoms of a Damaged Database Table Database-table damage can produce query errors, missing data, or application failures, but those... Troubleshooting cPanel Git Repository and Deployment Problems When a cPanel Git operation fails, check the repository configuration before retrying it... Diagnosing the WordPress “There Has Been a Critical Error” Message The WordPress critical-error message means a fatal error prevented WordPress from completing the... Diagnosing a WordPress White Screen A blank WordPress page can be caused by PHP or database errors. WordPress documentation lists... Using WordPress Recovery Mode to Isolate a Fatal Error WordPress Recovery Mode is a built-in feature that can activate when a fatal PHP error occurs... Diagnosing a WordPress Plugin Conflict A plugin conflict is most likely when a problem begins immediately after installing, activating,... Diagnosing a WordPress Theme Conflict A theme can cause fatal errors, blank pages, layout failures, or missing functionality when its... Clearing WordPress After It Is Stuck in Maintenance Mode During an update, WordPress creates a .maintenance file in the WordPress root directory. If an... Diagnosing WordPress Permalink 404 Errors If the WordPress home page works but posts or custom routes return 404, the rewrite rules used by... How to Remove an IP Block in cPanel To restore website access for an address previously blocked through cPanel: Open Security → IP... Diagnosing WordPress Changes That Still Show the Old Version WordPress itself does not include a general page cache by default, but browser cache, cache... Diagnosing a WordPress Core, Plugin, or Theme Update Failure WordPress updates can fail because of filesystem ownership/permissions, insufficient disk space,... Using WordPress Debug Logging Without Exposing Errors to Visitors WordPress provides WP_DEBUG, WP_DEBUG_LOG, and WP_DEBUG_DISPLAY for debugging. On a public site,... Diagnosing a WordPress Admin Area You Cannot Access If the public site or wp-admin fails after a plugin/theme change, use the least destructive path... Diagnosing a Domain That Works by IP but Not by Name If the server responds by IP address but the domain name does not reach it, focus on DNS and... Troubleshooting a Domain That Does Not Resolve If a domain does not resolve, work from registration outward instead of changing random DNS... Diagnosing Intermittent or Conflicting DNS Answers Different DNS answers can occur when authoritative nameservers do not contain matching zone data... Troubleshooting Database Connection Errors When an application reports that it cannot connect to its database, verify the connection in a... Why a DNS Change May Still Show the Old Value Seeing the old DNS value after a change does not always mean the edit failed. Check these... Diagnosing DNS After Changing a Domain’s Nameservers Changing nameservers changes which DNS servers are authoritative for the domain. The new... Troubleshooting www and Non-www Domain DNS example.com and www.example.com are different DNS names and can have different records. If one... Diagnosing DNSSEC After a Registrar, Nameserver, or Server Change DNSSEC validation depends on the DNSKEY information served by the authoritative DNS system... How to Enable or Disable ModSecurity for a Domain When the interface is available, open cPanel → Security → ModSecurity. You can enable or disable... Troubleshooting SERVFAIL After a DNSSEC Change A domain that suddenly returns SERVFAIL after a DNSSEC or nameserver change may have a broken... Diagnosing HTTPS That Works on One Hostname but Not Another An SSL certificate is valid only for the hostnames included in its certificate names. A... Troubleshooting a Domain That Opens the Wrong Website A domain can reach the correct server but still show the wrong website. This is often a... Troubleshooting a Possible ModSecurity 403 Error A blocked web request can sometimes appear as a 403 error, but not every 403 is caused by... Diagnosing AutoSSL When a Domain Does Not Resolve Correctly AutoSSL domain-control validation depends on the domain being reachable and correctly delegated.... Troubleshooting a Full cPanel Backup That Will Not Generate If a full backup does not complete, start with the basics: Check available disk space and account... Diagnosing a Force HTTPS Redirect Option That Is Unavailable cPanel’s Domains interface can force HTTP requests to HTTPS, but the option is available only... How to Avoid Conflicting DNS Records DNS zones can contain multiple records, but some combinations are invalid or produce confusing... Troubleshooting a cPanel Partial Restore That Fails If a partial restore fails: Confirm the file matches the selected restore type.Check that the... Diagnosing Email Delivery with cPanel Track Delivery cPanel Track Delivery displays delivery reports for messages handled by the account and can help... Troubleshooting Invalid cPanel 2FA Codes Time-based 2FA codes depend on accurate time. If cPanel reports that a current code is invalid:... Why a Record in cPanel May Not Affect Public DNS Zone Editor can display and edit a local DNS zone even when public DNS is being answered... Diagnosing a Mailbox That Cannot Receive New Messages A mailbox that reaches its assigned storage quota cannot receive additional mail. Account-wide... Diagnosing SPF, DKIM, DMARC, or PTR Warnings in Email Deliverability cPanel Email Deliverability checks mail-related DNS records that receiving systems use to... Diagnosing an Email Client That Cannot Connect Mail-client connection problems are often caused by using the wrong server name, port, encryption... Diagnosing FTP Connections That Stall or Time Out FTP uses separate command and data connections. A login can succeed while directory listings or... Troubleshooting a cPanel Cron Job That Does Not Run If a cron task does not behave as expected, check these items: Validate the... How to Review Website Errors in cPanel Open cPanel → Metrics → Errors to view up to 300 recent web-server error-log entries associated...