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Troubleshooting

Error codes, common pitfalls, and fixes for the most-Googled panel problems.

27 articles in this category

Articles in troubleshooting

Rspamd on cPanel: what's actually supported in 2026

cPanel & WHM has no native Rspamd integration — here's what the built-in stack actually is, why community Rspamd-on-Exim setups are risky, and when switching panels is the real answer.

Fix JetBackup license errors: invalid, not found, and IP mismatch

Diagnose JetBackup's license validation errors — no license found for this IP, license invalid for current server, and reissue failures — and fix each from WHM or the CLI.

Fix InterWorx license errors: invalid key and sync failures

Diagnose the Invalid InterWorx-CP License error — DNS and port 2443 checks, license.pex --sync, IP rebinding, and key swaps — before the 24-hour grace period ends.

Check your hosting panel license status from the command line

Every panel and add-on has a one-line SSH command that tells you whether its license is valid, active, and locked to the right IP. Here's the exact command for each.

Fix Plesk Let's Encrypt certificate renewal failures

The daily "Could not issue/renew Let's Encrypt certificates" email hides five distinct failures. Match the real error string to the fix — HTTP-01, DNS TXT, wildcard, rate limit, or stale chain.

Fix Imunify360 license errors and unregistered agent

Work through Imunify360 "No valid license" and "license is invalid for this server" errors in order — IP vs key registration, stale bindings after a migration, and user-count overruns.

Imunify360 malware cleanup and reinfection workflow

A working runbook for the moment Imunify360 flags malware on a shared box — cleanup vs restore, why quarantine is gone, the CLI commands, and how to stop the reinfection loop.

Clear a frozen or stuck Exim mail queue on cPanel

A decision tree for a cPanel Exim queue that won't drain — tell frozen from deferred, find the compromised account, and clear messages without nuking real mail.

Fix Plesk license errors: invalid, expired, and IP-bound keys

Decode the common Plesk license errors — invalid key, expired key, IP-bound, and connectivity failures — and fix each one from the CLI in minutes.

Fix 508 Resource Limit Is Reached on CloudLinux cPanel

A 508 error means one LVE limit got hit — usually entry processes. The decision tree for finding which limit, which user, and whether to raise it or fix the cause.

Fix CloudLinux "No valid license found" registration errors

Work through the CloudLinux "No valid license found" error in order — IP-based vs key-based registration, stale CLN server entries after a migration, and blocked outbound to cln.cloudlinux.com.

Reduce Imunify360 high CPU and RAM usage on cPanel

Isolate which Imunify360 component is eating load — scanner, real-time watcher, Proactive Defense, or WebShield — then tune MALWARE_SCAN_INTENSITY and disable the right pieces.

Tune Imunify360 WAF to stop blocking legitimate traffic

Disable Comodo/OWASP duplicate rulesets, set LF_MODSEC=0, and use /etc/imunify360/whitelist/*.txt to stop blocking legitimate plugin traffic.

Fix R1Soft 'no suitable hcpdriver module' error

Resolve R1Soft's 'no suitable hcpdriver module' error by aligning kernel and kernel-devel, opening krnlbld.r1soft.com on 443, or pulling a beta module.

Fix Plesk "server components not configured" after an upgrade

What triggers Plesk's "components not installed" state after an upgrade and the exact repair sequence using plesk installer and diagnose-repair.

Whitelist Plesk ModSecurity rules without breaking ruleset updates

Surgical fixes for Plesk ModSecurity false positives — by rule ID, by IP, per-domain, and per-directory — with snippets that survive ruleset updates.

Which cPanel backup format InterWorx's importer reads

Which cPanel backup type (full, daily, weekly) InterWorx's importer actually reads, and how to produce one that imports cleanly.

Run Imunify360 alongside CSF without double-blocking

Disable LF_MODSEC in CSF, keep SecRuleEngine in DetectionOnly where appropriate, and let Imunify360 own brute-force and WAF blocks.

Fix Softaculous "license file not found" after IP change

Refresh the Softaculous license from CLI after an IP change or migration, and reissue from the client area when the lock no longer matches.

Fix Plesk update failures — FetchFailedException, 502, and conflicts

Resolve the most-reported Plesk update errors — Package Update Manager FetchFailedException, HTTP 502 on autoinstaller, and 18.0.x upgrade conflicts.

Fix LiteSpeed license errors after migration or IP change

Resolve the common LiteSpeed licensing failures — signature mismatch after migration, IP-locked reseller keys, and expired-key downtime recovery.

Fix LSCache showing disabled in LiteSpeed Cache for WordPress

Why LSCWP shows 'disabled' — advanced-cache.php conflicts, server-level LSCache off, OLS vs LSWS config — and the exact toggles that re-enable caching.

Fix 'Cannot manage PHP versions' when CageFS is disabled

Resolve the CloudLinux PHP Selector error by removing pam_lve from sudo, rebuilding CageFS, and enabling CageFS for the affected user.

Disable cPanel backups when JetBackup is running

Why running both systems silently fills /backup, how to safely disable cPanel's backup config, and what to keep enabled for safety.

Fix WHM AutoSSL failures — a decision tree

AutoSSL fails in five distinct ways. Identify which one you're hitting from the WHM log line, then apply the fix — DNS, HTTP-01, CAA, rate-limit, or DCV redirect.

How to fix cPanel license invalid and verification errors

A 5-minute decision tree for the "License invalid" banner in WHM — covers IP changes, blocked outbound 2089, time drift, and the cpkeyclt refresh that fixes most of them.

WHM "Account creation failed: quota exceeded" — fix it

The three places this error actually comes from — the license, the disk, or the package. A 5-minute decision tree.

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