Basic DNS Troubleshooting in ProxySG

Products

• ProxySG Software - SGOS

Issue/Introduction

How to troubleshoot issues with DNS on Edge SWG (ProxySG).

Resolution

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>

note: to see additional options after url, type ?.  
To test DNS resolution against a specific DNS server.

# test dns <URL> <IP of DNS Server>

 

 

Example:

EdgeSWG#test dns www.example.com
Performing DNS lookup for: www.example.com

Sending A query for www.example.com to ##.##.##.##.

DNS Response data:
Official Host Name: www.example.com
Resolved Addresses:
  ##.##.##.##
Cache TTL: 9547, cache MISS
DNS Resolver Response: Success

 

2) To display or delete a DNS entry in the Edge SWG (ProxySG) cache:

              Management Console (https://<Proxy Appliance IP or Hostname>: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:

CLI:

# clear-cache dns-cache

Example:

BluecoatSG#clear-cache dns-cache
 ok

Management Console:

Maintenance > System and Disk > Tasks > ‘Clear’ the DNS cache