Why do users authenticated by Kerberos/SPNEGO get a second authentication screen on AEM Forms 6.3.0 when calling a WSDL file with a JDBC query?

[#1]

The authenticated users with Kerberos/SPNEGO access Workspace without any problems, but when the forms call WSDL file with a JDBC query the user gets a Windows Security prompt. Here is the prompt “The server xxxx-xxx1 is asking for your user name and password.  The server reports that it is from AXIS. Warning: Your user name and password will be sent using basic authentication on a connection that isn’t secure.” The authenticated users with Kerberos/SPNEGO have Workspace User and Service User roles assigned.  Local users do not get the prompt, and both the form and WSDL call work. My AEM Forms 6.3 is a Turnkey installation on a single server.

[#2]

I stumbled on the solution to my question.  To stop the second authentication, I have to
provide the fully qualified URL of the file.
For example if I used http://aemserver:8080/soap/services/WSDL/manualTest?wsdl&lc_version=11.0.0,
I will get a prompt.  When I use http://aemserver.myunit.mydepar.myorg:8080/soap/services/WSDL/manualTest?wsdl&lc_version=11.0.0,
I do not get the second prompt.