Worked perfectly thank you.

Having just finished my upgrade and rollout of proget 2025, I thought I'd take a look at otter as a possible puppet replacement.

Downloaded and installed Otter 2025.0 with no issues, and went through the basic demo.

However that is as far as I can go. I cannot add new servers in the interface. I have tried to select Agent, Powershell, and SSH and in all cases, as soon as you select one of the three, you get a (500) Server Error - Object reference not set to an instance of an object - popup.

Example Log:

An error occurred in the web application: Object reference not set to an instance of an object.

URL: http://localhost:8626/servers/edit/inedo-push
Referrer: http://localhost:8626/servers/select-agent
User: Admin
User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.36 Edg/139.0.0.0
Stack trace: at Inedo.Otter.WebApplication.Pages.Servers.Editing.EditAgentPageBase`1.CreateChildControls()
at Inedo.Otter.WebApplication.Pages.OtterSimplePage.InitializeAsync()
at Inedo.Web.PageFree.SimplePageBase.ExecutePageLifeCycleAsync()
at Inedo.Web.PageFree.SimplePageBase.ProcessRequestAsync(AhHttpContext context)
at Inedo.Web.AhWebMiddleware.InvokeAsync(HttpContext context)

::HTTP Error on 11/08/2025 11:14:21::

I cannot see any settings on the server that would be causing an issue, but it is currently preventing any testing if we cannot add any servers.

Windows 2025 Desktop Edition
Default New Install of Otter
Tested with local host ; IP and hostname in the url.