FAQ

Basic DNS Troubleshooting in ProxySG

FAQ ID:    FAQ546
Version:    1.0
Status:    Published
Published date:    10/16/2009
 

Answer

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>
Example:
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
Alias: www.google.com
Resolved Addresses:
74.125.19.147
74.125.19.103
74.125.19.104
74.125.19.99
74.125.19.106
74.125.19.105
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:
SGOS 5.x
CLI:
# clear-cache dns-cache
Example:
BluecoatSG#clear-cache dns-cache
 ok
               Management Console:
               Maintenance > System and Disk > Tasks > ‘Clear’ the DNS cache
 
For SGOS 4.x, please see KB1653.
 
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.

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