Hello,
https://www.youtube.com/watch?v=QiANmo2NHSs
Save this config in dll folder. file name be "web.config"
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<system.webServer>
<defaultDocument>
<files>
<add value="your_app_name.dll" />
</files>
</defaultDocument>
</system.webServer>
</configuration>
So you have not add port number & dll name to url link. And If you need still use with port number, add port number in binding too. So you can use default port 80 and your definition port too.
regards