WHMCS
Installation Guide
Release Notes
Change Log
Developer Documentation
Contact Support
Choose Version
Login
Getting Started
Get Started with WHMCS
Getting Started Wizard
The Admin Area
The Admin Dashboard
Setup Tasks
Migrate Data to WHMCS
Installation
System Requirements
Install WHMCS
Install on the Command Line
Install with Plesk WHMCS Installer
Install ionCube Loader
Set Up a Test Environment
Uninstall WHMCS
Initial Configuration
Enhancing Security
Secure Writeable Directories
The configuration.php File
Secure the Configuration File
Move the Cron Directory
Rename the Admin Directory
Restrict NGINX Directory Access
About WHMCS
WHMCS Development
WHMCS Distributions
WHMCS Glossary
Addon Modules
Addon Modules
Bulk Pricing Updater
Configurable Package Addon
E-Invoicing
Google Analytics
ImportAssist
KashFlow Accounting
Live Chat
MailChimp
Nova Cloud: Prompt First
PayPal Transaction Lookup
Project Management
Reseller License Manager
Software Licensing
SolusIO
Staff Noticeboard
Theme Editor
Translation Editor
WebPros Partner
Admins and the Admin Area
Admins
Apps & Integrations
Admin Tools
Notifications
My Account
Admin Tutorials
Accept an Admin Invitation
Add an Admin
Add or Edit an Administrator Role
Change the Number of Results
Configure an Admin Avatar
Configure Email Notifications
Configure Slack Notifications
Disable Admin Notifications
Disable an Admin
Edit an Admin
Log In to the Admin Area
Manage Dashboard Widgets
Resend an Admin Invite
Reset an Admin Password
Billing and Invoicing
Billing Logic
Billable Items and Time Billing
Credit and Debit Notes
Overage Billing
Prorata Billing
Invoice Management
Invoice Configuration
Custom PDF Invoices
On-Demand Renewals
Quotes
Billing Tutorials
Add a Billable Item
Add Time Billing
Invoicing Tutorials
Change Invoice Instructions
Change Your Payment Address
Configure Invoicing
Configure Payment Reminders
Convert Invoice Currencies
Create a Mass Payment Invoice
Create a Prorata Invoice
Create a Renewal Invoice Early
Create Separate Renewal Invoices
Customize Your Invoice Numbering
Enable Proforma Invoicing
Merge Invoices
Regenerate Invoices
Reissue an Invoice
Skip an Invoice
Snapshot Customer Invoice Data
Clients
Users and Client Accounts
Emailing Clients
Managing Users
Client Groups
Security Questions
Client Email Verification
Banned Emails
The Affiliate System
Affiliate System
Managing Affiliates
Affiliate Links
The Client Area
Announcements
Custom Fields
Linking to WHMCS
Maintenance Mode
Network Issues
The Client Profile
Summary Tab
Profile Tab
Users Tab
Contacts Tab
Products/Services Tab
Domains Tab
Billable Items Tab
Invoices Tab
Quotes Tab
Credit and Debit Notes Tab
Transactions Tab
Tickets Tab
Emails Tab
Notes Tab
Log Tab
Client Management Tutorials
Add a Client
Add and Associate Users
Match User and Client Details
Reset a User Password
Set a User Password Manually
Activate an Affiliate
Customize Affiliate Links
Delete Inactive Clients
Export Client Data
Require Opting-In to Emails
Require Terms and Conditions
Resend a Welcome Email
Customization
Countries and Calling Codes
Create Admin Dashboard Widgets
Custom Modules
Custom Order Form Templates
Custom Reports
Error Pages
Integration Code
Models
Sessions
Themes and Templates
Transliteration
WHMCS Base URL Template Variable
Single Sign-On into WHMCS
Client Area Customization
Client Area Homepage Panels
Client Area Layout
Client Area Navigation Menus
Client Area Sidebars
Customizing Promotions
Menu and Sidebar Context
Client Area Customization Tutorials
Preview a Template
Create a New Order Form Template
Create Customizations with Git
Customize Quick Shortcuts
Disable Feature Highlights
Manually Update Customizations
Update Customizations with Git
Homepage Panels
Add a Panel to Specific Pages
Add a Promotional Offer Panel
Add a Social Media Panel
Add a Special Offer Panel
Add an Informational Panel
Create a Two-Column Panel
Modify an Existing Panel
Rearrange Panels
Remove a Panel
Navigation
Add a Menu Item
Change a Menu Item Label
Change a Menu Item Link
Open Menu Links in New Tabs
Rearrange Menu Items
Remove a Menu Item
Sidebars
Add a Sidebar Item
Change a Sidebar Menu Label
Change a Sidebar Menu Link
Rearrange Sidebar Items
Remove a Sidebar Item
Domains
Selling and Managing Domains
Domain Registrars
Lookup Providers
Domain Statuses
Client Area Domain Registration
ICANN Policies
WHOIS Servers
SSL Monitoring
Domain Registrar Modules
101Domain
Affordable Domains
CentralNic Reseller
Email Notifications
Enom
GoDaddy
HEXONET
Internet.bs
IPMirror
Namecheap
NetEarthOne
Nominet
OnlineNIC
OpenSRS
Register.com
Register.eu
ResellerCamp
ResellerClub
Stargate/UK2
TPP Wholesale
TransIP
WebNIC
Domain Registration Tutorials
Add Spotlight TLD Logos
Automatically Renew on Payment
Configure a Domain Extension
Configure a Lookup Provider
Configure Grace Periods and Fees
Customize Registration Options
Disable Automatic Renewals
Enable Client Area Renewals
Manually Register a Domain
Manually Renew a Domain
Reattempt Registration or Transfer
Retry a Registrar Module Action
Set Default Nameservers
Set Domain Length Restrictions
Set Domain Renewal Restrictions
Set Up a Domain Registrar
Set Up the Enom Registrar
Transfer a Domain
Transfer a Domain to Another Client
Pricing and Configuration
Domain Pricing
Free Domains
International Domain Names
Premium Domains
Registrar Pricing Sync
Domain Categories
Custom Domain Fields
Renewals and Transfers
Domain Renewals
Domain Renewal Notices
Grace and Redemption Periods
Domain Transfers
Domain Resolver
MarketConnect
MarketConnect
MarketConnect Landing Pages
MarketConnect Promotions
MarketConnect Tutorials
Activate MarketConnect
Configure MarketConnect Pricing
Deposit Funds
Set Up Balance Alerts
Set Up Balance Reloading
Start Selling MarketConnect
Service Providers
360 Monitoring
CodeGuard
marketgoo
NordVPN
OX App Suite
SiteLock
SiteLock VPN
SpamExperts
SSL Certificates
SocialBee
Web.com Site Builder
Weebly
Nova Cloud
Mobile App
WHMCS Mobile Apps
Orders
Order Management
Order Statuses
Spam Orders
Fraud Protection
FraudLabs Pro
MaxMind
User Identity Verification
Order Tutorials
Create an Order
Activate an Order
Modify an Order
Payments
Pay Methods
Payment Gateways
Accepting PayPal
Disputes
Payment Reversals
Tokenization
Custom Gateway Modules
Transactions
Currencies
Tax Configuration
Credit Balances
Payment Gateway Modules
2CheckOut
Accept.js by Authorize.net
Authorize.net
Authorize.net CIM
Authorize.net Echeck
Bank Transfer
BitPay
BluePay
BluePay e-Check
BluePay Remote
Boleto
CCAvenue API v2
CCAvenue Legacy
Direct Debit
E-Path
eProcessingNetwork
eWAY
F2B
Forte
GoCardless
iDeal via Mollie
IP.Pay
Mail In Payment
Merchant Partners
Merchant Warrior
Moneris
Moneris Vault
Navigate
NETbilling
Netregistry Pay
NoChex
Offline Credit Card
Optimal Payments
Pay Junction
PayFlow Pro
Payment Express
PayPal Basic
PayPal Card Payments
PayPal Checkout
PayPal Payments
PayPal Pro Reference Payments
PayPal Website Payments Pro
Planet Authorize
PSIGate
Quantum Gateway
Quantum Vault
SagePay
SagePay Repeats
SagePay Tokens v2
SagePay VSP Form
SecurePay
SecurePay AU
SecureTrading
Skrill 1-Tap
Skrill Hosted Payment
Stripe
Stripe ACH
Stripe Dynamic Payments
Stripe SEPA
Turkish Garanti Bank
USA ePay
WorldPay
WorldPay FuturePay
Currency Tutorials
Automatically Update Prices
Change a Client's Currency
Change the Default Currency
Find a Base Conversion Rate
Sell in Multiple Currencies
Payment Gateway Tutorials
Add Restricted API Keys to Stripe
Allow Users to Delete Cards
Configure a Payment Gateway
Configure Payment Capture
Configure PayPal Payments
Copy a Gateway Module
Migrate Payment Gateways
Migrate to PayPal Checkout
Update the PayPal Webhook URL
Tax Tutorials
Change Invoice Tax Rates
Configure GST and Collect GSTINs for India
Configure VAT and Collect VAT IDs for Europe
Configure VAT and Collect VAT IDs for the UK
Update Tax Rates
Products
Products
Product Groups
Order Form Templates
Link Tracking
Upgrades and Downgrades
Cancellations
Promotions
Configuration Options
Product Configuration Options
Configurable Options
Cross-selling Recommendations
Product Addons
Sitejet Builder
Product Bundles
Product Downloads
Usage Billing
Selling WordPress
WordPress Hosting
WP Squared Hosting
WP Toolkit
Product Tutorials
Add Sitejet Builder to cPanel Products
Add Sitejet Builder to Plesk Products
Assign Custom Emails to Products
Automatically Provision Services
Bill Resellers Per Account
Change the Default Order Form Template
Change the Default Product Group
Configure On-Demand Renewals
Configure Product Group Features
Configure Recommendations
Configure Usage Billing
Create a Product
Create a Product Group
Create a Sitejet Builder Addon
Create an Addon
Enable Cross-selling
Enable Taxes for a Product
Hide or Retire Products
Link to a Product
Offer Free Trials
Service Management Tutorials
Cancel Services Immediately
Delete a Service
Schedule a Service Termination
Transfer a Service to Another Client
Update the Recurring Amount
Upgrade or Downgrade a Service
Releases
Updating Through EOL Versions
9.1
9.1 Release Highlights
9.1 Release Notes
9.1 Change Log
Servers
Servers
Server Groups
Sync Accounts
WHMCS Connect
Server Tutorials
Create a Server
Create a cPanel Server
Create a DirectAdmin Server
Create a Plesk Server
Create a WP Squared Server
Customize Monitoring Ports
Migrate cPanel Services
Delete a Server
Server Modules
Ahsay Backups
Auto Release
Centova Cast
Cloudmin
cPanel
DirectAdmin
Enom SSL
FreeRADIUS
GlobalSign SSL
Helm
Helm 4
HyperVM
InterWorx
Nova Experience on cPanel
Plesk
Reseller Central
ResellerClub SSL
SCPanel
SolusVM
TCAdmin
Virtualizor
Virtualmin Pro
VPS.net
WebsitePanel
WHMSonic
WP Squared
Support
Support Tools
Support Departments
Email Importing
Email Piping
Support Tickets
Ticket Actions
Ticket Statuses
Predefined Replies
Spam Control
Knowledgebase
Downloads
Knowledgebase Tutorials
Add a Knowledgebase Article
Add a Knowledgebase Category
Enable Knowledgebase Suggestions
Support Tutorials
Add a Predefined Reply
Add a Support Department
Disable Client Ticket Closure
Prune Ticket Attachments
Remove Quoted Email Replies
Schedule a Ticket Action
Set Up Email Importing
Set Up Email Importing - Google
Set Up Email Importing - Microsoft
Set Up Email Piping - cPanel
Use a Predefined Reply
View and Import Blocked Replies
System
Analytics Tracking
Banned IP Addresses
Captcha Protection
Data Feeds
Friendly URLs
License Information
Reports
System Cleanup
Trusted Proxies
Authentication
Two-Factor Authentication
Duo® Security
API Credentials
Single Sign-On
Application Links
Sign-In Integrations
OpenID Connect
OpenID Connect Development
Authentication Tutorials
Enable 2FA Globally
Enable 2FA for Admins
Enable 2FA for Clients
Log In Without a Backup Code
Log In Without a Token
Require 2FA
Sign In Using Facebook
Sign In Using Google
Sign In Using Twitter
Automation
Automation Settings
Automation Status
System Cron
Domain Sync Task
Cron Tutorials
Check the Cron Job Status
Configure the System Cron Job
Configure When Daily Tasks Run
Find the Cron php.ini File
Resolve a Cron PHP Mismatch
Database and Storage
Database Backups
Database Status
Storage Settings
Database and Storage Tutorials
Disable MySQL Strict Mode
Enable Encrypted MySQL
Migrate Local Storage
Migrate Storage Locations
Restore the WHMCS Database
Set Up Amazon S3 Storage
Set Up an Amazon S3 Bucket
Email
Email Campaigns
Email Marketer
Email Templates
Mail Providers
Email Tutorials
Change the From Address
Configure Email Styling
Customize Email Templates
Disable Outgoing Mail
Get Copies of System Emails
Localize Email Templates
Restore Default Email Templates
Set a Global Email Signature
Use Google for System Mail
Use Microsoft for System Mail
Use Other Providers for System Mail
Use SMTP for System Mail
General Settings
Affiliates
Credit
Domains
General
Invoices
Localisation
Mail
Ordering
Other
Security
Social
Support
Localization
Localization Tutorials
Change How Dates Display
Customize Text
Enable the Language Menu
Set the Default Locale
Translate Custom Status Names
Translate Product Text
Localization
PHP
Custom Template PHP
Login Session Length
PHP Info
PHP Upgrades
PHP Version Compatibility
Smarty Security Policy
Updates
Update Tutorials
Check for Updates
Prepare to Update WHMCS
Schedule Automatic Updates
Set a Maintenance Message
Set the Temporary Update Path
Set the Update Channel
Update in the Browser
Update on the Command Line
Update with the Automatic Updater
Updating WHMCS
Unattended Automatic Updates
Legacy Module Removal
System Tutorials
Enable Default Captchas
Enable hCaptcha®
Enable reCAPTCHA v3
Change the System Charset
Change the System Theme
Customize Your Logo
Disable Analytics Tracking
Enable Friendly URLs
Force a License Update
Move WHMCS to a New Server
Move WHMCS to a New Subdomain
Optimize Performance
Update PHP with cPanel MultiPHP
Update the System URL
Troubleshooting
Start Troubleshooting
Enable Error Reporting
Errors in WHMCS
Grant Access to WHMCS Support
Logs in WHMCS
Module Queue
Refresh a Directory
System Health
General Troubleshooting
General Troubleshooting
404 Page Not Found Errors
Admin Directory Errors
Blank Admin Dashboard
Blank or Partially-Rendered Pages
Character Display in Reports
Corrupt File Errors
cURL Couldn't Connect to Host Errors
cURL Couldn't Resolve Host Errors
cURL Timeout Errors
Dataset Must Be Array Errors
Down for Maintenance Errors
Duplicate System Theme Options
Empty Pages
Failed Opening Errors
File Cannot Be Decoded Errors
File Not Found Errors
Filename Not Allowed Errors
Impossible root Errors
LogicException Template Errors
Missing Country Customizations
Module Command Unknown Errors
Oops! Errors
Query String URI Errors
Redirect Loops
Sensitive Directory Check Errors
Server Communication Errors
Server IP Address in Logs
Troubleshoot WHMCS Cloud
Troubleshooting WHMCS Cloud
Missing Features on WHMCS Cloud
Troubleshoot Addon Modules
Troubleshooting Addon Modules
Addon Module Oops! Errors
Missing Addon Modules
Nova Cloud: Prompt First
Nova Cloud License External ID Errors
Nova Cloud Deep-Link Failures
E-Invoicing
E-Invoicing Configuration Errors
E-Invoicing License Errors
E-Invoicing Account Sync Errors
E-Invoicing Client Data Errors
E-Invoicing Invoice Export Errors
Invoice Already Submitted Errors
E-Invoicing Status Update Errors
Refused E-Invoice Status
ImportAssist
Client Import Failed Errors
Cloud ImportAssist Errors
Import Validation Failures
ImportAssist Unable to Connect
Missing Imported Clients
Live Chat
Live Chat Connection Errors
Live Chat Display Issues
Live Chat Login and License Errors
Live Chat Server or Host Errors
Live Chat SMTP Errors
Software Licensing
Licensing Invalid Key Errors
Licensing Local Key Generation
Licensing Remote Check Errors
Theme Editor
Theme Deletion Errors
Theme Editor Creation Errors
Translation Editor
Translation Editor Content Errors
WebPros Partner
Blank Nova Settings
cPanel License Assigned Errors
cPanel License Configurable Option Errors
cPanel License Deactivated Errors
cPanel License Missing IP Address
cPanel License Reactivation Errors
cPanel Licensing Options Errors
Product Temporarily Unavailable Errors
Riva Login Errors
WebPros Cloud Service Credential Errors
WebPros Partner Provisioning Errors
Troubleshoot Authentication
Troubleshooting Authentication
2FA Storage Migration Messages
Cloudflare Proxy Check Errors
Duo Security Login Failures
Expired Admin Invite Links
Facebook App Not Setup Errors
Facebook URL Errors
Frequent Logouts
Google Remote Linking Failures
Google Sign In Unavailable Errors
Google Verification Failures
Invalid Details Errors
Invalid Reset Link Errors
Login Details Errors
Login Redirect Loops
Oops! Access Denied Errors
Oops! Too Many Requests Errors
Password Length Range Messages
Password Rejected Errors
Password Reuse Range Messages
PHP Session Storage Errors
Remember Me Session Ended
Sessions Are Not Removed
Single Sign-On Active Session Errors
Single Sign-On Closed User Errors
Single Sign-On Configuration Errors
Single Sign-On Token Errors
Social Login Errors
Twitter Connection Errors
Twitter Link Initiated Messages
Unable to Access Sign-In Integrations
Troubleshoot Cron Issues
Troubleshooting the System Cron
Cron Failures
Cron Frequency Warnings
Cron HTTP Access Denied Errors
Cron Input File Errors
Cron Metrics Polling Timeout
Cron System Queue Timeout
Cron Time of Day Issues
Fatal Memory Size Errors
Intermittent Cron Failures
No Input File Specified Errors
System Timezone Issues
Unable to Communicate Errors
Undefined curl_init() Function Errors
Whoops Exception Errors
Troubleshoot Customizations
Troubleshooting Customizations
Troubleshooting Hooks
Troubleshooting System Themes
Troubleshooting WHMCS API Calls
Troubleshoot Domains
Troubleshooting Domains
Blank Choose a Domain Page
Blank Domain Search Results
Domain Availability Errors
Domain Management Oops! Errors
Domain Pricing Will Not Save
Free Domain Is Not Free
Missing Contact Details Errors
Missing Registrant Contact Errors
No Nameservers Are Defined Errors
OpenSSL Registrar Errors
Registration Suppressed Errors
Suppressed Renewal Errors
Sync Not Supported Errors
TransIP Update Delays
TypeError AdditionalFields Errors
Unable to Display Pricing Errors
CentralNic Reseller
Entity Reference Errors
Enom
Bad User name or Password Errors
Enom API cURL Errors
Enom Domain Not Found Errors
Enom Empty Response Errors
Enom Invalid Data Errors
Enom Renewal Balance Failures
Enom User Not Permitted Errors
GoDaddy
GoDaddy Request Body Errors
HEXONET
HEXONET Disconnections and Failures
HEXONET Empty Response Errors
Namecheap
Namecheap Nameserver Errors
Namecheap Registrar Errors
Nominet
Nominet Command Syntax Errors
Nominet Connection Errors
Nominet Socket Transport Errors
OnlineNIC
OnlineNIC Connection Errors
OpenSRS
OpenSRS Connection Errors
OpenSRS Domain Renewed Errors
OpenSRS Order Errors
ResellerClub
ResellerClub Access Errors
ResellerClub Connection Errors
ResellerClub Language Code Errors
ResellerClub Locked Errors
ResellerClub Login Errors
ResellerClub Missing Name Errors
ResellerClub Pending Actions
ResellerClub Telephone Errors
ResellerClub Unexpected Errors
ResellerClub Unknown Fault Errors
ResellerClub Website Errors
WebNIC
WebNIC IP Address Errors
WebNIC Login Errors
WebNIC Partner Failures
Troubleshoot Email
Troubleshooting System Email
Broken Renewal Links in Emails
Data Not Accepted Errors
Email Flagged as Spam
Email Template Syntax Errors
Failed Recipients
Message Body Empty Errors
No Recipients Errors
SendEmail Sending Failure
Sending Aborted by Hook
Sending Aborted Configuration
Sending Aborted Errors
Smarty Policy Errors
Undisclosed Recipients
Unsent General Emails
Unsent Ticket Notifications
Unsent Welcome Emails
Microsoft®
Microsoft Connection Failures
Microsoft Mail Query Errors
PHP Mail
Could Not Instantiate Errors
Undefined PHPMailer Function Errors
SMTP
Sender Verify Failed Errors
SMTP Authentication Errors
SMTP Connection Errors
SMTP Password Command Failed Errors
Troubleshoot Installation
Troubleshooting Installation
Duplicate tblconfiguration Errors
License Key Required Errors
Stuck Installation Process
Administrator Password Refused Errors
Troubleshoot Invoices
Troubleshooting Invoices
Blank Invoices
Cancelled Domain Renewal Invoices
Duplicate Invoices (Different Dates)
Duplicate Invoices (Same Dates)
Duplicate tblinvoices Errors
Invoice Immutability Errors
Invoices Are Missing Tax
Logout During Invoice Download
Missing Domain Renewal Invoices
Missing Payment Reminders
Missing Service Invoices
Question Marks in PDF Invoices
TCPDF Image Size Errors
TCPDF Timeouts
Unexpected Invoice Details
Unexpected Next Due Date
Troubleshoot Licensing
Troubleshooting Licensing
Invalid License API Errors
Invalid License Errors
Invalid Licenses on HostGator
No Connection Errors
Troubleshoot MarketConnect
Troubleshooting MarketConnect
MarketConnect 404 Errors
MX and SPF Record Errors
Promotion Display Issues
Nova Cloud
Nova Cloud License State Errors
SSL Certificates
Instant Issuance Deployment Errors
Instant Issuance Not Acquired Errors
Instant Issuance Unspecified Errors
Instant Issuance Validation Errors
Key Generation Failed Errors
SSL Provisioning Issues
Troubleshoot Orders
Troubleshooting Orders
Invalid Registration Period Errors
MaxMind License Key Errors
MaxMind License Required Errors
MaxMind Request Errors
MaxMind User ID Errors
Troubleshoot Payments
Troubleshooting Payments
Blank Payment Gateway Page
Configuration Function Errors
Duplicate Transactions
Exchange Rate Update Failures
Gateway Module Activation Errors
Invalid Access Attempt Errors
Invalid Login Credentials
Invalid VAT Format Errors
Invalid VAT Number Errors
MD5 Hash Failures
No Gateway Log Entries
Oops! Module Not Found Errors
Quantum Vault Missing Ending Errors
Remote Transaction Failure Errors
Unexplained Declines and Failures
Unrecorded Transactions
Unsupported Protocol Errors
User Redirected to Wrong Page
Stripe Dynamic Payments
Missing Stripe Payment Options
Stripe Add Payment Method Errors
2CheckOut
2CheckOut Inline Checkout Crash
Authentication Failed Errors
PE101 Errors
Authorize.net
Field is Required Errors
BitPay
BitPay Token Errors
BitPay Token Migration Alerts
Missed BitPay Notifications
eWay
Missing Card Fields
GoCardless
GoCardless Inactive Token Errors
GoCardless Remote Storage Errors
iDeal via Mollie
iDeal via Mollie Transaction Errors
PayPal®
Duplicate Invoice ID Errors
Missing PayPal Payments
Missing PayPal Subscriptions
Orphaned PayPal Subscriptions
PayFlow Pro Local Card Errors
PayFlow Pro Remote Storage Errors
PayPal IPN Failures
PayPal Log Entries
PayPal Old Transaction Errors
PayPal Security Errors
PayPal SSL Errors
PayPal Transaction ID Errors
PayPal® Invalid Receiver Errors
PayPal® Not Supported Errors
PayPal® Not Working Errors
PayPal® Unrecognized Currency Errors
Unexpected PayPal Cancellation Emails
Skrill
Skrill Secret Word Errors
Stripe
No Stripe Customer Details Errors
Stripe ACH General Errors
Stripe ACH Invalid Token Errors
Stripe and RBI Regulations
Stripe Bad Request Errors
Stripe CVC Value Errors
Stripe Network Errors
Stripe Payment Method Errors
Stripe PCI Compliance Issues
Stripe Remote Transaction Failures
Stripe Statement Descriptor Errors
Stripe Try Again Errors
WorldPay
Payment Response Password Errors
WorldPay Invisible NMTOKEN Errors
Troubleshoot PHP
Troubleshooting PHP
500 Internal Server Errors
Allowed Memory Exhausted Errors
ExceptionLoggingTrait Errors
OPcache Warnings
PHP Execution Time Errors
PHP Tag Errors
Required Function Errors
Segmentation Fault Errors
Smarty Variable Errors
TypeError covertIniSize Errors
TypeError guessFileExtension Errors
Troubleshoot Products and Services
Troubleshooting Products and Services
Member Function Renewal Errors
On-Demand Renewal Unsupported
Recommendation Display Issues
Service Not Prorated
shortDescription Errors
Unexpected Service Suspensions
Unexpected Service Terminations
Troubleshoot Servers
Troubleshooting Server Issues
406 Not Acceptable Errors
Account Creation Failures
Product Module Missing Errors
Server Deletion Errors
Status Monitoring Display Issues
cPanel & WHM Servers
Access Denied Errors
Action Failed Errors
Group Already Exists Errors
Invalid cpmod Errors
Invalid Numeric Value Errors
License Profile Errors
Login Failed Errors
Missing Username Errors
Missing WHM Packages
Missing WHM Username Errors
Package Not Allowed Errors
Package Permission Errors
Product Attribute Errors
Reseller Subdomain Errors
Username Reserved Errors
wptoolkitcli Errors
Plesk Servers
_getSSORedirectUrl Errors
Blank Command Errors
Client Pool Errors
Domain Setup Failures
Email Not Found Errors
Invalid Request Errors
Limitations Exceeded Errors
Parser Errors
Permission Denied Errors
Plesk Connection Errors
Plesk Login Errors
Template Errors
Unsupported Protocol Errors
Username Required Errors
Version Errors
www Does Not Work
Troubleshoot SSL
Troubleshooting SSL
Certificate Not Detected Errors
Certificate Subject Mismatch Errors
Insecure Connection SSL Errors
Invalid or Corrupt Certificate Errors
Outdated root CA Bundles
Troubleshoot the Client Area
Troubleshooting the Client Area
Captcha Verification Failed
Client Area Title Display Issues
Invalid Site Key Errors
Order Now Refreshes the Page
Prices Incorrect in Cart
Troubleshoot the Database
Troubleshooting the Database
(S)FTP Backup Upload Errors
(S)FTP Unable to Open Errors
(S)FTP Unable to Write Errors
Argument PDOStatement Errors
Base Table or View Not Found Errors
Column group_id Null Errors
Command Denied Errors
Could Not Connect Errors
Duplicate Entry Errors
Field Default Value Errors
Large Database Backup Failures
Missing Zip Extension Errors
MySQL Server Gone Away Errors
Order Not Found Errors
POP3 General Error 3988 Errors
SFTP Backup Login Errors
Table Doesn't Exist Errors
Unable to Connect Errors
Valid Dump Path Errors
Troubleshoot the Support System
Troubleshooting the Support System
Missing Support Notifications
Scheduled Action Failures
Ticket ID Not Found Errors
Support Departments
Department Access Denied Errors
Department Not Found Errors
Ticket Replies
Argument 7 Ticket Errors
Attachment Upload Failures
Auto-Submitted Header Errors
Cannot Connect to Host Errors
Connection Refused Errors
Duplicate Imported Replies
Duplicate Piped DirectAdmin Replies
Email Loop Errors
Invalid SASL Argument Errors
Local Delivery Failed Errors
Logon Failure Errors
Mail Import Test Failed Errors
Microsoft Bad Request Errors
Microsoft Connection Errors
Microsoft Import Query Errors
POP3 [AUTH] Errors
POP3 Cron Not Running
POP3 Read Failed Errors
Single ID Errors
Undefined Method Importing Errors
Unregistered Address Errors
Troubleshoot Updates
Troubleshooting Updates
Application Configuration Errors
Automatic Update Connectivity Errors
Automatic Update Permission Errors
Automatic Update Version Data Errors
Automatic Update Version Unavailable Errors
Automatic Updates Unavailable
Check for Updates Failures
Fatal Error Fetching Update
Feature Issues After Update
File Download Errors
GuardedForUpdate Errors
Legacy Module Removal Errors
Network Issue Errors
New Version Not Appearing
No Existing Installation Errors
Permanent Automatic Update Failures
Update Channel Errors
Update Dry Run Errors
Update Failed Errors
Update Message Validation Errors
WHMCS
Releases
9.1
9.1 Release Highlights
9.1 Release Highlights
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Last modified:
2026 September 30