System net webexception удаленный сервер возвратил ошибку 500

On reading your question I was suspicious this has to do with (or could be corrected by) setting the KeepAlive to false. Looking on SO — this question references the same problem and points to it as well: https://stackoverflow.com/a/2071374/1803682

Try setting:

request.KeepAlive = false;

With KeepAlive set to false your connection will be closed at the end of each request. If you are transmitting a lot of files this could be an issue — as it takes time to resend credentials, etc. The upside is you recreate the connection in a known / initial state which should solve your problem (even if it is not the root cause).

To see what is going on, if you can enable detailed logging on your server you should see the last command issued before seeing this error returned. This should give you a better idea of what is up. Found this thread saying much the same thing.

Update:

If I had read to the bottom of the link I posted myself I could have answered even better, the command probably being reissued is some part of the login process (i.e. USER username) and this is your likely issue:

The reason the creadentials may no longer be valid is that the
WebRequest uses a lease that expires after a certain amount of time.
If you don’t explicitly instantiate the lease and define its timeouts,
the FtpWebRequest appears to use default timeout values. I believe
what’s happening is that when the lease expires the FtpWebRequest will
then try to log on again.

So looking here with the right search:

yields that the default timeout waiting for requests is not infinite as specified but actually 10000 ms. Which seems a pretty big discrepancy. So you can also try setting:

request.Timeout = -1;

And see if it corrects your error.

Really don’t think this could be your issue so moving it to the bottom:

Also — check that your request.ReadWriteTimeout is appropriate for the speed you see for the larger file. The default is 5 minutes which would be pretty long for 290k, so I expect this is not the source of your error. Also — I would expect a connection closed error if this was the problem.

после обновление CU на Exchange 2013 перестали подключаться Outlook 2016
клиенты Outlook 2010, 2013 работают, OWA работает, новые 2016 — нет — постоянно запрашивает пароль (внутри сети и снаружи)
https*testconnectivity.microsoft.com сообщает:

Attempting to send an Autodiscover POST request to potential Autodiscover URLs.
Autodiscover settings weren't obtained when the Autodiscover POST request was sent.

Additional Details

Elapsed Time: 1952 ms.

Test Steps

The Microsoft Connectivity Analyzer is attempting to retrieve an XML Autodiscover response from URL https://autodiscover.mydomain.ru:443/Autodiscover/... for user derba@mydomain.ru.
The Microsoft Connectivity Analyzer failed to obtain an Autodiscover XML response.

Additional Details

An HTTP 500 response was returned from Unknown.
HTTP Response Headers:
request-id: 28560d3f-60a9-4d38-ba3e-9fe5d42aecc8
X-CalculatedBETarget: kvmail.mydomain.local
X-DiagInfo: KVMAIL
X-BEServer: KVMAIL
Cache-Control: private
Set-Cookie: ClientId=9QNDYXGKKVZALFBOSQ; expires=Wed, 25-Jul-2018 08:38:55 GMT; path=/; HttpOnly,X-BackEndCookie=S-1-5-21-1903798712-2405474663-4193718316-2295=u56Lnp2ejJqBz53IzJybxsrSxsfNntLLzsnG0sbJmczSzsyenMecyJqbzp2egYHNz87I0s/H0s3Lq8/HxczHxcrJ; expires=Thu, 24-Aug-2017 08:38:56 GMT; path=/Autodiscover; secure; HttpOnly
Server: Microsoft-IIS/8.5
X-AspNet-Version: 4.0.30319
Persistent-Auth: true
X-Powered-By: ASP.NET
X-FEServer: KVMAIL
Date: Tue, 25 Jul 2017 08:38:55 GMT
Content-Length: 0
Elapsed Time: 1952 ms.

накатил CU 15 — не помогло … накатил CU 17 — не помогло.

при открытии https*192.168.0.12/Autodiscover/Autodiscover.xml (извне
тоже самое) запрашивает пароль, после ввода показывает:

This XML file does not appear to have any style information associated with it. The document tree is shown below.
600Недопустимый запрос

переставлял IIS — не помогло.

[PS] C:>get-autodiscovervirtualdirectory | fl *path*
Выполняется создание нового сеанса для неявного удаленного взаимодействия команды "Get-AutodiscoverVirtualDirectory"...

MetabasePath : IIS://kvmail.mydomain.local/W3SVC/1/ROOT/Autodiscover
Path : C:Program FilesMicrosoftExchange ServerV15FrontEndHttpProxyAutodiscover

для пользователей «Прошедшие проверку» явно указал до папки C:Program FilesMicrosoftExchange ServerV15FrontEndHttpProxyAutodiscover права на чтение

[PS] C:>iisreset /noforce

Попытка остановки...
Службы Интернета успешно остановлены
Попытка запуска...
Службы Интернета успешно перезапущены
[PS] C:>Test-WebServicesConnectivity
Выполняется создание нового сеанса для неявного удаленного взаимодействия команды "Test-WebServicesConnectivity"...

Source ServiceEndpoint Scenario Result Latency
(MS)
------ --------------- -------- ------ -------
KVMAIL.domain.local autodiscover.mydomain.ru Автообнаружение: поставщик ... Failure 551
KVMAIL.domain.local EWS: GetFolder Skipped 0

[PS] C:>
[PS] C:>Test-WebServicesConnectivity | fl

RunspaceId : 6cf74bba-9812-4863-8641-88f1f3eeb753
Source : KVMAIL.domain.local
ServiceEndpoint : autodiscover.mydomain.ru
Scenario : AutoDiscoverSoapProvider
ScenarioDescription : Автообнаружение: поставщик SOAP
Result : Failure
Latency : 50
Error : System.Net.WebException: Удаленный сервер возвратил ошибку: (500) Внутренняя ошибка сервера.
в System.Net.HttpWebRequest.GetResponse()
в Microsoft.Exchange.Management.SystemConfigurationTasks.ServiceValidatorBase.InternalInvoke()
в Microsoft.Exchange.Management.SystemConfigurationTasks.ServiceValidatorBase.Invoke()
Verbose : [2017-07-25 22:06:20Z] Подключение Автообнаружение к "https://autodiscover.mydomain.ru/autodiscover/auto...".
[2017-07-25 22:06:20Z] Тестовая учетная запись: extest_91809daefd5e4@domain.local Пароль: ******
[2017-07-25 22:06:20Z] Запрос Автообнаружение:
User-Agent: KVMAIL/Test-WebServicesConnectivity/extest_91809daefd5e4@domain.local
Content-Type: text/xml; charset=utf-8
Authorization: Negotiate TlRMTVNTUAADAAAAGAAYAKoAAABkAWQBwgAAAAAAAABYAAAARABEAFgAAAAOAA4AnAAAABAAEAAmAgAAFYKI4gYDgCUAAAAP2jc/Z1olP4tXSSAeEc
AF8AOQAxADgAMAA5AGQAYQBlAGYAZAA1AGUANABAAG0AYQBnAGEAZABhAG4ALgBsAG8AYwBhAGwASwBWAFAATQBBAEkATAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAzGxPzJfeumcZ
ABIAiY/kgXTAT9/szZqaD2kAAAAAAIADgBNAEEARwBBAEQAQQBOAAEADgBLAFYAUABNAEEASQBMAAQAGgBtAGEAZwBhAGQAYQBuAC4AbABvAGMAYQBsAAMAKgBrAHYAcABtAGEAaQBs
EAbgAuAGwAbwBjAGEAbAAFABoAbQBhAGcAYQBkAGEAbgAuAGwAbwBjAGEAbAAHAAgASAImP5IF0wEGAAQAAgAAAAgAMAAwAAAAAAAAAAAAAAAAQAAAZB7M3pgHJN9JMYimsUzCsbO/A
KABAAx8wbQsBX7MrEx9zBcspCtAkAPgBIAFQAVABQAC8AYQB1AHQAbwBkAGkAcwBjAG8AdgBlAHIALgBtAGEAZwBhAGQAYQBuAGsAdgBwAC4AcgB1AAAAAAAAAAAAAAAAAEPe+B6G5X
Host: autodiscover.mydomain.ru
Cookie: ClientId=BEQIIQTUOFXWHNXSLG
Content-Length: 1149
Expect: 100-continue
[2017-07-25 22:06:20Z] Запрос Автообнаружение:
<?xml version="1.0" encoding="utf-8" standalone="yes"?>
Exchange2010schemas.microsoft.com/exchange/2010/Autodiscover/A...

[2017-07-25 22:06:20Z] Ответ Автообнаружение:
request-id: d3514bb0-2f8f-4a05-a0ab-b08652c42180
X-CalculatedBETarget: KVMAIL.domain.local
X-DiagInfo: KVMAIL
X-BEServer: KVMAIL
Persistent-Auth: true
X-FEServer: KVMAIL
Content-Length: 0
Cache-Control: private
Date: Tue, 25 Jul 2017 22:06:19 GMT
Set-Cookie: X-BackEndCookie=S-1-5-21-1903798712-2405474663-4193718316-2291=u56Lnp2ejJqBzJ6byMyZxszSxpvMyNLLzZzO0seax53Sx5qbnp3Pys6az8zMgYHN
/Jxc3P; expires=Thu, 24-Aug-2017 22:06:20 GMT; path=/autodiscover; secure; HttpOnly
Server: Microsoft-IIS/8.5
X-AspNet-Version: 4.0.30319
X-Powered-By: ASP.NET
[2017-07-25 22:06:20Z] Ответ Автообнаружение:
System.Net.WebException: Удаленный сервер возвратил ошибку: (500) Внутренняя ошибка сервера.
в System.Net.HttpWebRequest.GetResponse()
в Microsoft.Exchange.Management.SystemConfigurationTasks.ServiceValidatorBase.InternalInvoke()
в Microsoft.Exchange.Management.SystemConfigurationTasks.ServiceValidatorBase.Invoke()
MonitoringEventId : 6051

RunspaceId : 6cf74bba-9812-4863-8641-88f1f3eeb753
Source : KVMAIL.domain.local
ServiceEndpoint :
Scenario : EwsGetFolder
ScenarioDescription : EWS: GetFolder
Result : Skipped
Latency : 0
Error : Пропущено тестирование веб-служб Exchange из-за ошибки на шаге автообнаружения.
Verbose :
MonitoringEventId : 5053

User-621232634 posted

Hello guys,

  I have the following error and I have no idea how to fix it. I tried but I couldn’t figure out the solution yet. Please if anyone can offer help, I would appreciate that.  

Server Error in '/' Application.

The remote server returned an error: (500) Internal Server Error. 
  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.Net.WebException: The remote server returned an error: (500) Internal Server Error.

Source Error: 



Line 105:            PostSoapClient oClient = new PostSoapClient();
Line 106:            oClient.Open();
Line 107:            HeritageCompany.wsPost.CreditCardResponse creditCardResponse = oClient.DoPost(creditCardRequest);
Line 108:            string response = "GatewayTransactionId: " + creditCardResponse.GatewayTxnId;
Line 109:            response = response + "tGatewayResponseCode: " + creditCardResponse.GatewayRspCode;
  

 Source File:  C:Usersmontadardocumentsvisual studio 2015ProjectsHeritageCompanyHeritageCompanyTest.aspx.cs    Line:  107 

Stack Trace: 



[WebException: The remote server returned an error: (500) Internal Server Error.]
   System.Net.HttpWebRequest.GetResponse() +1390
   System.ServiceModel.Channels.HttpChannelRequest.WaitForReply(TimeSpan timeout) +55

[ProtocolException: The content type text/html; charset=utf-8 of the response message does not match the content type of the binding (text/xml; charset=utf-8). If using a custom encoder, be sure that the IsContentTypeSupported method is implemented properly. The first 1024 bytes of the response were: '<!DOCTYPE html>
<html>
    <head>
        <title>Parser Error</title>
        <meta name="viewport" content="width=device-width" />
        <style>
         body {font-family:"Verdana";font-weight:normal;font-size: .7em;color:black;} 
         p {font-family:"Verdana";font-weight:normal;color:black;margin-top: -5px}
         b {font-family:"Verdana";font-weight:bold;color:black;margin-top: -5px}
         H1 { font-family:"Verdana";font-weight:normal;font-size:18pt;color:red }
         H2 { font-family:"Verdana";font-weight:normal;font-size:14pt;color:maroon }
         pre {font-family:"Consolas","Lucida Console",Monospace;font-size:11pt;margin:0;padding:0.5em;line-height:14pt}
         .marker {font-weight: bold; color: black;text-decoration: none;}
         .version {color: gray;}
         .error {margin-bottom: 10px;}
         .expandable { text-decoration:underline; font-weight:bold; color:navy; cursor:hand; }
         @media screen and (max-width: 639px) {
          pre { width: 440px; ov'.]
   System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg) +153
   System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type) +336
   HeritageCompany.wsPost.PostSoap.DoPost(DoPostRequest request) +0
   HeritageCompany.wsPost.PostSoapClient.HeritageCompany.wsPost.PostSoap.DoPost(DoPostRequest request) +73
   HeritageCompany.wsPost.PostSoapClient.DoPost(CreditCardRequest creditCardRequest) +123
   HeritageCompany.Test.btnPost_Click(Object sender, EventArgs e) in C:Usersmontadardocumentsvisual studio 2015ProjectsHeritageCompanyHeritageCompanyTest.aspx.cs:107
   System.Web.UI.WebControls.Button.OnClick(EventArgs e) +9696754
   System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +204
   System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +12
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +15
   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +35
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1639

 

Here is the code in C#: It throw an error and when it hits this line : HeritageCompany.wsPost.CreditCardResponse creditCardResponse = oClient.DoPost(creditCardRequest);

using Microsoft.Practices.EnterpriseLibrary.Common.Configuration;
using Microsoft.Practices.EnterpriseLibrary.Logging;
using System;
using System.Diagnostics;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.ServiceModel.Channels;
using HeritageCompany.wsPost;
namespace HeritageCompany
{
    public class Test : Page
    {
        protected HtmlForm form1;

        protected TextBox tbClientNumber;

        protected TextBox tbClientCode;

        protected TextBox tbAccountNumber;

        protected TextBox tbCardType;

        protected TextBox tbCardNumber;

        protected TextBox tbCVV2;

        protected TextBox tbExpiryMonth;

        protected TextBox tbExpiryYear;

        protected TextBox tbAmount;

        protected TextBox tbFirstName;

        protected TextBox tbLastName;

        protected TextBox tbAddress;

        protected TextBox tbCity;

        protected TextBox tbState;

        protected TextBox tbZipCode;

        protected TextBox tbUserData;

        protected TextBox tbUserID;

        protected Button btnPost;

        protected HtmlGenericControl spanResults;

        public IConfigurationSource configurationSource = null;

        public LogWriterFactory logWriterFactory = null;

        public LogWriter logWriter = null;

        protected void Page_Load(object sender, System.EventArgs e)
        {
        }

        public void InitializeLogger()
        {
            this.configurationSource = ConfigurationSourceFactory.Create();
            this.logWriterFactory = new LogWriterFactory(this.configurationSource);
            this.logWriter = this.logWriterFactory.Create();
        }

        public void LogMessage(string categories, string message, System.Diagnostics.TraceEventType traceEventType, int priority)
        {
            string[] a_Categories = categories.Split(new char[]
            {
                ','
            });
            LogEntry logEntry = new LogEntry();
            logEntry.Message = message;
            logEntry.Priority = priority;
            logEntry.Categories = a_Categories;
            logEntry.Severity = traceEventType;
            this.logWriter.Write(logEntry);
        }

        protected void btnPost_Click(object sender, System.EventArgs e)
        {
            HeritageCompany.wsPost.CreditCardRequest creditCardRequest = new HeritageCompany.wsPost.CreditCardRequest();
            creditCardRequest.ClientNumber = this.tbClientNumber.Text;
            creditCardRequest.ClientCode = this.tbClientCode.Text;
            creditCardRequest.AccountNumber = this.tbAccountNumber.Text;
            creditCardRequest.CardType = this.tbCardType.Text;
            creditCardRequest.CardNumber = this.tbCardNumber.Text;
            creditCardRequest.ExpiryMonth = this.tbExpiryMonth.Text;
            creditCardRequest.ExpiryYear = this.tbExpiryYear.Text;
            creditCardRequest.CVV2 = this.tbCVV2.Text;
            creditCardRequest.Amount = this.tbAmount.Text;
            creditCardRequest.FirstName = this.tbFirstName.Text;
            creditCardRequest.LastName = this.tbLastName.Text;
            creditCardRequest.Address = this.tbAddress.Text;
            creditCardRequest.City = this.tbCity.Text;
            creditCardRequest.State = this.tbState.Text;
            creditCardRequest.ZipCode = this.tbZipCode.Text;
            creditCardRequest.UserData = this.tbUserData.Text;
            creditCardRequest.UserID = this.tbUserID.Text;
            PostSoapClient oClient = new PostSoapClient();
            oClient.Open();
            HeritageCompany.wsPost.CreditCardResponse creditCardResponse = oClient.DoPost(creditCardRequest);
            string response = "GatewayTransactionId: " + creditCardResponse.GatewayTxnId;
            response = response + "tGatewayResponseCode: " + creditCardResponse.GatewayRspCode;
            response = response + "tGatewayResponseMessage: " + creditCardResponse.GatewayRspMsg;
            response = response + "tResponseCode: " + creditCardResponse.RspCode;
            response = response + "tAuthorizationCode: " + creditCardResponse.AuthCode;
            response = response + "tHPICN: " + creditCardResponse.HPICN;
            this.spanResults.InnerHtml = response;
        }
    }
}

and here is the html file:

<html>
	<head>
		<title>Heritage CC Post</title>

<script type="text/javascript" src="_ScriptHelpers.js"></script>
<script type="text/javascript" src="jquery-1.11.2.min.js"></script>

<script type="text/javascript">

</script>
</head>
<body>
	<p>
	Here we are
</p>
<table id="tblParams" border="1" width="90%">
 <tr>
	 <td style="font-weight:bold">ClientNumber</td>
	 <td><input id="ClientNumber" value="4081" /></td>
	 <td style="font-weight:bold">ClientCode</td>
	 <td><input id="ClientCode" value="C" /></td>
	 <td style="font-weight:bold">AccountNumber</td>
	 <td><input id="AccountNumber" value="012345678" /></td>
	 </tr>
	 <tr>
	 <td style="font-weight:bold">CardType</td>
	 <td><input id="CardType" value="VISA" /></td>
	 <td style="font-weight:bold">CardNumber</td>
	 <td><input id="CardNumber" value="4012002000060016" /></td>
	 <td style="font-weight:bold">CVV2</td>
	 <td><input id="CVV2" value="123" /></td>
	 </tr>
	 <tr>
	 <td style="font-weight:bold">ExpiryMonth</td>
	 <td><input id="ExpiryMonth" value="11" /></td>
	 <td style="font-weight:bold">ExpiryYear</td>
	 <td><input id="ExpiryYear" value="2016" /></td>
	 <td style="font-weight:bold">Amount</td>
	 <td><input id="Amount" value="100.00" /></td>
	 </tr>
	 <tr>
	 <td style="font-weight:bold">FirstName</td>
	 <td><input id="FirstName" value="JOHN" /></td>
	 <td style="font-weight:bold">LastName</td>
	 <td><input id="LastName" value="DOE" /></td>
	 <td style="font-weight:bold">Address</td>
	 <td><input id="Address" value="2402 WILWOOD AVENUE" /></td>
	 </tr>
	 <tr>
	 <td style="font-weight:bold">City</td>
	 <td><input id="City" value="SHERWOOD" /></td>
	 <td style="font-weight:bold">State</td>
	 <td><input id="State" value="AR" /></td>
	 <td style="font-weight:bold">ZipCode</td>
	 <td><input id="ZipCode" value="72120" /></td>
	 </tr>
	 <tr>
	 <td style="font-weight:bold">UserData</td>
	 <td><input id="UserData" value="Unify_UserData" /></td>
	 <td style="font-weight:bold">UserID</td>
	 <td><input id="UserID" value="Unify" /></td>
	 <td style="font-weight:bold">&nbsp;</td>
	 <td>&nbsp;</td>
	 </tr>
</table>
	<br/>
	<input id="btnDoPost" type="button" value="DoPost" onclick="return DoPost();"/>
	<br/>
	<p>Results below:<br/>
	<span id="spanResults">&nbsp;</span>
	</p>

</body>
</html>

and here is the Post.asmx file

using Microsoft.Practices.EnterpriseLibrary.Common.Configuration;
using Microsoft.Practices.EnterpriseLibrary.Logging;
using System;
using System.ComponentModel;
using System.Configuration;
using System.Diagnostics;
using System.IO;
using System.Net;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Web.Script.Services;
using System.Web.Services;
using System.Xml;

namespace HeritageCompany
{
    [System.ComponentModel.ToolboxItem(false), ScriptService, WebService(Namespace = "http://unify.com/products/contact-centers/Campaign-Director/PS/HeritageCC"), WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    //[ToolboxItem(false), ScriptService, WebService(Namespace = "http://tempuri.org/"), WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    public class Post : WebService
    {
        [WebMethod]
        public CreditCardResponse DoPost(CreditCardRequest creditCardRequest)
        {
            IConfigurationSource configurationSource = ConfigurationSourceFactory.Create();
            LogWriterFactory logWriterFactory = new LogWriterFactory(configurationSource);
            LogWriter logWriter = logWriterFactory.Create();
            this.LogMessage(logWriter, "General", "DoPost()", "beginning of function...", System.Diagnostics.TraceEventType.Verbose, 10);
            string sendXml = string.Empty;
            string logXml = string.Empty;
            string g_xml = "<?xml version="1.0" encoding="UTF-8"?><PosRequest><Header><ClientNumber></ClientNumber><ClientCode></ClientCode><AccountNumber></AccountNumber>";
            g_xml += "<UserData></UserData><UserID></UserID></Header><CreditSale><CardData><CardType></CardType><CardNumber></CardNumber><ExpiryMonth></ExpiryMonth><ExpiryYear></ExpiryYear>";
            g_xml += "<CardPresent>N</CardPresent><ReaderPresent>N</ReaderPresent><CVV2></CVV2></CardData><Amount></Amount><CardHolderData><FirstName></FirstName><LastName></LastName>";
            g_xml += "<Address></Address><City></City><State></State><ZipCode></ZipCode></CardHolderData></CreditSale></PosRequest>";
            string sFields = "ClientNumber,ClientCode,AccountNumber,CardType,CardNumber,ExpiryMonth,ExpiryYear,CVV2,Amount,FirstName,LastName,Address,City,State,ZipCode,UserData,UserID";
            string[] aFields = sFields.Split(new char[]
            {
                ','
            });
            XmlDocument xDoc = new XmlDocument();
            xDoc.LoadXml(g_xml);
            for (int i = 0; i < aFields.Length; i++)
            {
                xDoc.SelectSingleNode("//" + aFields[i]).InnerXml = (string)creditCardRequest[aFields[i]];
            }
            sendXml = "xml="" + xDoc.OuterXml + """;
            logXml = sendXml.Replace(creditCardRequest["CardNumber"].ToString(), "blahblahblah");
            this.LogMessage(logWriter, "General", "Request", logXml, System.Diagnostics.TraceEventType.Verbose, 20);
            string CCServiceUrl = ConfigurationManager.AppSettings["CCServiceUrl"];
            System.Net.WebRequest request = System.Net.WebRequest.Create(CCServiceUrl);
            request.UseDefaultCredentials = true;
            System.Net.ServicePointManager.ServerCertificateValidationCallback = (System.Net.Security.RemoteCertificateValidationCallback)System.Delegate.Combine(System.Net.ServicePointManager.ServerCertificateValidationCallback, new System.Net.Security.RemoteCertificateValidationCallback(Post.ValidateServerCertificate));
            request.Method = "POST";
            byte[] byteArray = System.Text.Encoding.UTF8.GetBytes(sendXml);
            request.ContentType = "application/x-www-form-urlencoded";
            request.ContentLength = (long)byteArray.Length;
            System.IO.Stream dataStream = request.GetRequestStream();
            dataStream.Write(byteArray, 0, byteArray.Length);
            dataStream.Close();
            System.Net.WebResponse response = request.GetResponse();
            dataStream = response.GetResponseStream();
            System.IO.StreamReader reader = new System.IO.StreamReader(dataStream);
            string responseFromServer = reader.ReadToEnd();
            responseFromServer = responseFromServer.Replace("r", "");
            responseFromServer = responseFromServer.Replace("n", "");
            responseFromServer = responseFromServer.Replace("  ", "");
            this.LogMessage(logWriter, "General", "Response", responseFromServer, System.Diagnostics.TraceEventType.Verbose, 20);
            xDoc.LoadXml(responseFromServer);
            CreditCardResponse creditCardResponse = new CreditCardResponse(xDoc.SelectSingleNode("//GatewayTxnId").InnerXml, xDoc.SelectSingleNode("//GatewayRspCode").InnerXml, xDoc.SelectSingleNode("//GatewayRspMsg").InnerXml, xDoc.SelectSingleNode("//RspCode").InnerXml, xDoc.SelectSingleNode("//AuthCode").InnerXml, xDoc.SelectSingleNode("//HPICN").InnerXml);
            reader.Close();
            dataStream.Close();
            response.Close();
            logWriter.Dispose();
            logWriterFactory.Dispose();
            configurationSource.Dispose();
            return creditCardResponse;
        }
        public static bool ValidateServerCertificate(object sender, System.Security.Cryptography.X509Certificates.X509Certificate certificate, System.Security.Cryptography.X509Certificates.X509Chain chain, System.Net.Security.SslPolicyErrors sslPolicyErrors)
        {
            return true;
        }

        public void InitializeLogger()
        {
        }
        public void LogMessage(LogWriter logWriter, string categories, string title, string message, System.Diagnostics.TraceEventType traceEventType, int priority)
        {
            string[] a_Categories = categories.Split(new char[]
            {
                ','
            });
            logWriter.Write(new LogEntry
            {
                Title = title,
                Message = message,
                Priority = priority,
                Categories = a_Categories,
                Severity = traceEventType
            });
        }
    }
}

codes above are main ones if you need related codes, I can supply it. Thank you very much for your help

Никак. На то это и внутренняя ошибка, что клиенту ничего про нее знать не нужно. В браузере вы можете что-то видеть только если сервер запущен с тестовой конфигурацией (когда в случае ошибки отображает страницу со стектрейсом).

UPD

нужное вам поведение можно получить как-то так:

[ApiController]
    public class TestController : ControllerBase
    {
        [HttpGet]
        public Task ChangeStatus()
        {
            throw new Exception("My test exception");
        }
    }

public class HttpResponseExceptionFilter : IActionFilter, IOrderedFilter
{
        public void OnActionExecuted(ActionExecutedContext context)
        {
            if (context.Exception != null)
            {
                context.Result = new ObjectResult(new
                {
                    ErrorText = context.Exception.Message,
                    Stacktrace = context.Exception.StackTrace
                })
                { StatusCode = (int)HttpStatusCode.BadRequest };

                context.Exception = null;

                return;
         }
}

тогда дергнув контроллера вы обратно получите 400ую ошибку с контентом

{
«errorText»: «My test exception»,
«stacktrace»: «stacktrace was here»
}

UPD2:
ну и насколько я помню (а я могу быть не прав, но не могу перепроверить сейчас) — HttpWebRequest будет кидать ексепшн для всех не 200 хттп статусов. Потому возможно стектрейс прийдется доставать не очень красиво

WebRequest request = ...;
try
{
  using var response = request.GetResponse();
  ...
}
catch (WebException e)
{
  using var webResponse = (HttpWebResponse)e.Response;
  var code = webResponse.StatusCode;
  var body = ...;

  //...

}

или использовть HttpClient, который ексепшн кидает только если попросить