Knowledge base

Answers to common questions about your services, accounts and support.

Knowledge Base

Windows Update Fails – Error 0x800f0831

Fix Clear update cache: net stop wuauserv net stop bits del /f /s /q %windir%\\SoftwareDistribution Restart services.

Apple iOS (iOS 17/18)

iPhone Not Sending/Receiving Emails (IMAP/Exchange) Fix Remove and re-add the email account Ensure: IMAP Port: 993 SMTP Port: 587 SSL = ON Reset network settings: Settings → General…

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How to Improve Windows Performance Using Built-in System Commands

Boost Windows Performance with SFC & DISM Commands Is your Windows PC running slower than usual? Before installing third-party tools, you should try the powerful diagnostic and repair…

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External Emails Not Delivering – “Relay Access Denied”

Cause Postfix not configured as the correct relay Wrong mydestination / relayhost setting Resolution Edit /etc/postfix/main.cf myhostname = mail.example.com myorigin = /etc/mailname mydestination = localhost relayhost = Restart:…

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High CPU – “Windows Defender Antimalware Service Executable”

Fix Add extension exclusions:Settings → Virus & threat protection → Exclusions Disable real-time protection temporarily.

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Critical Error – White Screen of Death

Cause Plugin conflict Theme issue PHP version mismatch Fix Enable debug: define( \'WP_DEBUG\', true ); Rename /wp-content/plugins to disable all plugins Switch theme to Twenty Twenty-Five Ensure PHP…

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Postfix Rejecting Emails – “Header_Checks Bad Syntax”

Cause Incorrect regex in /etc/postfix/header_checks Fix Validate syntax Example correct format: /^Subject:.*(Large US\\$ amounts)/ DISCARD Compile map: postmap header_checks Restart postfix.

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Emails Marked as Spam in O365 Despite Correct SPF/DKIM/DMARC

Cause Low IP reputation Bulk sending Missing ARC seal for forwarded mail Fix Validate all authentication: https://mxtoolbox.com Enable ARC: Admin Center → Email authentication → ARC → Enable…

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Email Not Sending from WordPress

Cause Missing SMTP Hosting block SPF/DKIM fail Fix Install WP Mail SMTP plugin Setup SMTP (SendGrid / Gmail SMTP / Mailgun) Verify SPF: v=spf1 include:sendgrid.net -all Enable DKIM…

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Outlook cannot connect to Exchange (“Disconnected” Status)

Cause Autodiscover DNS missing Wrong Outlook virtual directory URL Authentication disabled Resolution Check DNS autodiscover..com → public IP Run: Test-OutlookConnectivity Reset virtual directory Reset-AutodiscoverVirtualDirectory -Identity \"Server\\Autodiscover (Default Web…

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SSH Not Working After Reboot

Cause SSH disabled Firewall blocking port 22 Fix systemctl enable ssh ufw allow 22 systemctl restart ssh

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WordPress Extremely Slow After Update

Fix Disable heavy plugins (Elementor, GutenKit, WPBakery). Install Query Monitor plugin to identify slow SQL. Use object cache plugin (Redis recommended). Update PHP memory limit: define(\'WP_MEMORY_LIMIT\', \'512M\');

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