Basic DNS Troubleshooting in ProxySG

Products

• ProxySG Software - SGOS

Issue/Introduction

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 000013063.

 

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.