I am wondering why your attached image shows 2 copies of the “Hello World” application? Did you accidentally install it twice, or did the first install not work and you tried a second install? What happened when you ran the first one? Same error or a different message?
NaturalONE Hello World Sample Application
NaturalONE Hello World Sample Application(1)
I suggest deleting the second one, with the (1) appended. Then try to get the first one to work. Two copies of the same application make it difficult to modify the configuration/preferences settings and keep straight which is which.
I don’t know why your error was complaining about port 2801. The default port for NaturalONE to use for localhost should be 2800.
Highlight the first NaturalONE Hello World Sample Application and select Run -> Run Configurations -> Natural Application ->
Default Launch. Select the Natural Server tab, which should show Host Name: localhost, and Port Number: 2800.
Also note that in the SRC directory, the HELLO-A.NS8 and HELLO-P-NSP should not have " ^% " after them That means they have syntax errors or just haven’t been Updated and Saved. Right click on them and select NaturalONE -> Update to catalog the object module. If you made any changes to the source it should also ask if you want to Save source, or click the floppy disk icon on the 2nd toolbar.
If you still get these Port Number errors, I guess you could try deleting both Hello World applications and then reinstall it once, leaving all settings with their defaults.
If nothing works, report back with your results and hopefully someone who knows more than me will answer.