This comprehensive guide explains why this error occurs and provides step-by-step solutions to fix it and restore your web filtering capabilities. Understanding the Error
If the problem persists, you may be encountering a bug that has already been fixed in a newer version. GFI regularly releases patches to resolve these types of issues.
The Web Filter relies heavily on DNS to communicate with the Zvelo servers. Incorrect DNS settings are a frequent cause of "Invalid Authorization" errors. This comprehensive guide explains why this error occurs
If you manage a network using (now part of GFI Software), you rely on its web filtering capabilities to enforce acceptable use policies, block malware domains, and regulate bandwidth. So, it’s more than a little alarming when you log into the administration interface and see the dreaded red or orange alert:
Kerio Control automatically checks external servers. If 10 consecutive queries fail within 60 seconds, it marks the engine as unreliable and disables categorization. The Web Filter relies heavily on DNS to
…the firewall will either block nothing or block everything based on fallback rules, and category-based policies (e.g., block “Social Media”) won’t work.
Warning: Direct file manipulation can break your installation. Backup first. So, it’s more than a little alarming when
: Create a rule allowing traffic from the Firewall itself to: prod-update.kerio.com register.kerio.com control-update.kerio.com support.keriocontrol.gfi.com Verification Steps Navigate to Content Filter Applications and Web Categories and enter any website (e.g., google.com
Go to . Ensure DNS forwarding is configured properly and that the firewall itself can resolve external queries. Step 3: Check Time Synchronization (NTP)
For network administrators using the Kerio Control firewall, encountering the error is a critical issue. This error completely halts URL traffic filtering, leaving your network vulnerable to malicious websites and unauthorized content.
Check subscription/license