Configuring DNS Subdomains

Some URLs contain host names with many levels of subdomains. The proxy server might take a long time to do DNS checks if the first DNS server cannot resolve the host name. You can set the number of levels that the Proxy Server will check before returning a “host not found” message to the client.

For example, if the client requests http://www.sj.ca.example.com/index.html, the proxy could take a long time to resolve that host into an IP address because it might have to go through four DNS servers to get the IP address for the host computer. Because these lookups can take a lot of time, you can configure the proxy server to quit looking up an IP address if the proxy has to use more than a certain number of DNS servers.

To Set the Levels of Subdomains For Proxy Lookup

1. Access the Server Manager and click the Preferences tab.

2. Click the Configure DNS Subdomains link.

   The Configure DNS Subdomains page is displayed.

3. Select a resource from the drop-down list or specify a regular expression.

4. Select the number of levels from the Local Subdomain Depth drop-down list.

5. Click OK.

6. Click Restart Required.

   The Apply Changes page is displayed.

7. Click the Restart Proxy Server button to apply the changes.