Fail to make API call

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OS Name/Version: Ubunto 20

Product Name/Version:Amp 2.4.0.4

Problem Description:

:Anonymous
16:37:05

at ADSModule.WebMethods.MakeInstanceRequest (m.Http.IHttpRequest request, String REQ_RAWJSON, String requesturi) at ADSModule.WebMethods.Servers (m.Http.IHttpRequest request, String id, String REQ_RAWJSON)
IOException
[1] (IOException) : Unable to read data from the transport connection: Operation aborted.
[0] (TaskCanceledException) : The operation was canceled.
at ADSModule.WebMethods.MakeInstanceRequest (m.Http.IHttpRequest request, String REQ_RAWJSON, String requesturi) at ADSModule.WebMethods.Servers (m.Http.IHttpRequest request, String id, String REQ_RAWJSON)
IOException
at Net.Sockets.Socket+AwaitableSocketAsyncEventArgs.ThrowException (Net.Sockets.SocketError error) at Net.Sockets.Socket+AwaitableSocketAsyncEventArgs.GetResult (Int16 token) at Net.Http.HttpConnection.FillAsync () at Net.Http.HttpConnection.ReadNextResponseHeaderLineAsync (Boolean foldedHeadersAllowed)
SocketException
[1] (IOException) : Unable to read data from the transport connection: Operation aborted.
[2] (SocketException) : Operation aborted
at Net.Sockets.Socket+AwaitableSocketAsyncEventArgs.ThrowException (Net.Sockets.SocketError error) at Net.Sockets.Socket+AwaitableSocketAsyncEventArgs.GetResult (Int16 token) at Net.Http.HttpConnection.FillAsync () at Net.Http.HttpConnection.ReadNextResponseHeaderLineAsync (Boolean foldedHeadersAllowed)
SocketException
[2] (SocketException) : Operation aborted

16:37:39

Failure to make API call to Citybuild (http://127.0.0.1:8081/API/Core/Login) - retried 10 times : The operation was canceled.
TaskCanceledException
[0] (TaskCanceledException) : The operation was canceled.
at ADSModule.WebMethods.MakeInstanceRequest (m.Http.IHttpRequest request, String REQ_RAWJSON, String requesturi) at ADSModule.WebMethods.Servers (m.Http.IHttpRequest request, String id, String REQ_RAWJSON)
IOException
[1] (IOException) : Unable to read data from the transport connection: Operation aborted.
at Net.Sockets.Socket+AwaitableSocketAsyncEventArgs.ThrowException (Net.Sockets.SocketError error) at Net.Sockets.Socket+AwaitableSocketAsyncEventArgs.GetResult (Int16 token) at Net.Http.HttpConnection.FillAsync () at Net.Http.HttpConnection.ReadNextResponseHeaderLineAsync (Boolean foldedHeadersAllowed)
SocketException
[2] (SocketException) : Operation aborted

16:37:55

Failure to make API call to Citybuild (http://127.0.0.1:8081/API/Core/Login) - retried 10 times : The operation was canceled.
TaskCanceledException
[0] (TaskCanceledException) : The operation was canceled.
at ADSModule.WebMethods.MakeInstanceRequest (m.Http.IHttpRequest request, String REQ_RAWJSON, String requesturi) at ADSModule.WebMethods.Servers (m.Http.IHttpRequest request, String id, String REQ_RAWJSON)
IOException
[1] (IOException) : Unable to read data from the transport connection: Operation aborted.
at Net.Sockets.Socket+AwaitableSocketAsyncEventArgs.ThrowException (Net.Sockets.SocketError error) at Net.Sockets.Socket+AwaitableSocketAsyncEventArgs.GetResult (Int16 token) at Net.Http.HttpConnection.FillAsync () at Net.Http.HttpConnection.ReadNextResponseHeaderLineAsync (Boolean foldedHeadersAllowed)
SocketException
[2] (SocketException) : Operation aborted
Steps to reproduce:

 * reboot server than 5 minute work than:  unknown Reason
 * reboot ADS01 disable ufw firewall add all AMp Ports tcp, udp : unkown reason
 *  add ports to ufw ,enable ufw creacte new user: work 5 min than block

Actions taken to resolve so far:
I speak German but the translator is my best friend.
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