DNS name resolution does not work after upgrade of PAN-OS to 10.1.5 and above

• System logs (show log system) for DNS names display "Could not resolve host".
• Ping from the cli shows "System error" or " Temporary failure in name resolution" if the dns name is used in a query.

> ping host serverlist.urlcloud.paloaltonetworks.com
ping: serverlist.urlcloud.paloaltonetworks.com: System error

> ping host serverlist.urlcloud.paloaltonetworks.com
ping: serverlist.urlcloud.paloaltonetworks.com: Temporary failure in name resolution.

• Palo Alto Firewalls
• PAN-OS 10.1.5 and above
• DNS Resolution

• The configured system domain starts with a  period (".")

# show deviceconfig system | match domain
set deviceconfig system domain .threatlab.local

• Setting is configured under GUI: Device > Setup > Management > General Setting

1. The issue is resolved under PAN-193484 in PAN-OS 10.1.11, 10.2.3 and above.
2. Upgrade to the fixed version will resolve the issue.
3. As a workaround, remove the period (".") when configuring the system domain name. 

#set deviceconfig system domain <domain not starting with a ".">