If a URL is not accessible through a GajShield firewall, it could be due to several reasons:
Firewall rule: The firewall might have a rule that is blocking access to the URL.
Antivirus software: The URL might be blocked by the firewall's antivirus software if it is deemed malicious.
DNS resolution: The URL might not be accessible if there is an issue with the firewall's DNS resolution.
Network connectivity: There might be a network connectivity issue between the firewall and the URL.
It is recommended to check the firewall's logs and policies to determine the cause of the issue and resolve it accordingly.