1. Håvard Heide
  2. Beta Testing
  3. Wednesday, 19 May 2021 12:00 PM UTC

Starting PB2021 as administrator

Build & deployed   project succesfully

Compile & Run Web API   gives   (see attached file)

Attachments (1)
Francisco Martinez @Appeon Accepted Answer Pending Moderation
  1. Wednesday, 19 May 2021 14:43 PM UTC
  2. Beta Testing
  3. # 1

Hi, Håvard

This error can happen because the port you're trying to use is reserved by Windows

You can check if you're trying to use a reserved port by opening <SnapDevelop project folder>\ServerAPIs\Properties\launchSettings.json
The profiles.ServerAPIs.applicationUrl indicates the IP address and port that Kestrel will bind to when starting the API Server. Please remember the port number.

Now, execute the following command inside a Windows CMD Terminal: netsh interface ipv4 show excludedportrange protocol=tcp

If the port assigned to profiles.ServerAPIs.applicationUrl is in this list, all you have to do is change the port of the Web API URL in the PowerServer project to a value not in the list and redeploy your PowerServer project.

I hope this helps!


  1. Håvard Heide
  2. Thursday, 20 May 2021 11:50 AM UTC
I haven't used Snapdevelop - Did not set any port
  1. Helpful
  1. Francisco Martinez @Appeon
  2. Thursday, 20 May 2021 14:15 PM UTC
When you deploy a PowerServer 2021 project, a SnapDevelop project is generated on the location you specified in the WebAPIs tab, the port is also specified there. You can take a look and see if the automatically selected port might be in the Windows reserved port list
  1. Helpful
There are no comments made yet.
  • Page :
  • 1

There are no replies made for this question yet.
However, you are not allowed to reply to this question.
We use cookies which are necessary for the proper functioning of our websites. We also use cookies to analyze our traffic, improve your experience and provide social media features. If you continue to use this site, you consent to our use of cookies.