1) Test DNS response:
Performs a DNS lookup and displays debugging information describes the lookup. The following example is from the command line interface (CLI) after entering into enable mode:
#test DNS <url>
BluecoatSG#test dns www.google.com
Performing DNS lookup for: www.google.com
Sending A query for www.google.com to 10.105.12.36.
DNS Response data:
Official Host Name: www.l.google.com
Cache TTL: 155, cache MISS
DNS Resolver Response: Success
2) To display or delete a DNS entry in the ProxySG cache:
Management Console (https://<ip.address.of.proxysg>:8082/ ) > Statistics tab > Advanced > DNS > Show list of DNS URLs. Here is where you can see DNS entries or delete them.
3) Clear all DNS cache:
# clear-cache dns-cache
Maintenance > System and Disk > Tasks > ‘Clear’ the DNS cache
4) Try to use another DNS Server.
Management Console (https://<ip.address.of.proxysg>:8082/ ) > Configuration tab > Network > DNS > New. Enter the new DNS server information in here. To save your changes, click on the Apply button.