D-Link DFL-860 Product Manual - Page 436
Turning Off FQDN Resolution, Disable CRLs
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9.6. CA Server Access Chapter 9. VPN As explained previously, the address of the private CA server must be resolvable through public DNS servers for certificate validation requests coming from the public Internet. If the certificate queries are coming only from the NetDefend Firewall and the CA server is on the internal side of the firewall then the IP address of the internal DNS server must be configured in NetDefendOS so that these requests can be resolved. Turning Off FQDN Resolution As explained in the troubleshooting section below, identifying problems with CA server access can be done by turning off the requirement to validate certificates. Attempts to access CA servers by NetDefendOS can be disabled with the Disable CRLs option for certificate objects. This means that checking against the CA server's revocation list will be turned off and access to the server will not be attempted. 436
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