If thats the case i assume you have the wrong error attached to the issue.

download first feed failed: System.Net.WebException: Url ‘ https://developer.microsoft.com/en-us/web/webpi/5.0/WebProductList.xml’ returned HTTP status code: 404

Is a Web app feed error, you would get when someone is trying for example to install wordpress or similar.

The url is also set in system settings of SolidCP portal (so you can change it even when server(s) are broken).

If you just want to remove a server that no longer responds easiest way is via database (it will have the same restrictions as removing it via portal just more quick to find and delete all related packages).

Then kindly show steps how to resolve this error, I still not understand what to do right now. Just outline is okay, more details would be appreciated!

Any answer how to resolve this? 🙁

For the error mentioned there's an application feed url in the SolidCP Portal --> System Settings --> Application feed area.

Just add the custom urls as given in the forum post in my previous answer and the feed url should no longer give error 404.

Look like it generate another error:

System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> Object reference not set to an instance of an object.
at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall)
at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters)
at SolidCP.Server.WindowsServer.GetWPIProductById(String productdId)
at SolidCP.EnterpriseServer.esServers.GetWPIProductById(Int32 serverId, String productdId)

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.Web.Services.Protocols.SoapException: System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> Object reference not set to an instance of an object.
at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall)
at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters)
at SolidCP.Server.WindowsServer.GetWPIProductById(String productdId)
at SolidCP.EnterpriseServer.esServers.GetWPIProductById(Int32 serverId, String productdId)