In Symantec Web Gateway (SWG) Custom Reports, the hostname shows as nothing.attdns.com.
Drilling down to System name "nothing.attdns.com" in the report shows the IP address.
The custom report does not display the proper hostname but incorrect hostname "nothing.attdns.com".
Google search shows the following result for the issue.
This nothing.attdns.com is a name resolution problem and may have been caused by not having the correct reverse lookup zones on the DNS server.
If you see nothing.attdns.com in the SWG custom report, you may try the following two options to avoid this issue.
1. Add the IP address ranges for all the subnets to the DNS server as reverse lookup zones should resolve the problem.
2. Login to the SWG user interface.
Go to Administration -> Configuration -> Reports page.
Symantec Web Gateway 18.104.22.168