Custom authorization not working properly in IIS server but working fine in localhost(ASP.NET CORE WEBAPI)

We have created a custom attribute in our ASP.Net Core 2.0 WebAPI project for token verification. When the token value is correct the API works well in both 

localhost

 and after publishing. The problem we face is when the token is incorrect, the error message is displayed in 

localhost

 but it errors on live. It shows error 

could not get any response

 in postman.

What we should do to display response message from the handler itself?

Here is our code:

usingMicrosoft.AspNetCore.Authorization;usingMicrosoft.AspNetCore.Http;usingNewtonsoft.Json;usingSystem;usingSystem.Collections.Generic;usingSystem.IO;usingSystem.Linq;usingSystem.Text;usingSystem.Threading.Tasks;usingWebCloudPlex.Models.Common;usingWebCouldPlex.Compilers.IntegrationLogic;namespaceWebCloudPlex.Compilers.AuthenticationOptions{publicclass credentialsHandler :AuthorizationHandler<credentialRequirement>{ClsIntegrationObjClsIntegration=newClsIntegration();ResponseMessageObjResponse=newResponseMessage();List<string>ObjListString=newList<string>();privatereadonlyIHttpContextAccessor contextAccessor;public credentialsHandler(IHttpContextAccessor contextAccessor){this.contextAccessor = contextAccessor;}protectedoverrideTaskHandleRequirementAsync(AuthorizationHandlerContext context, credentialRequirement requirement){try{stringAccess_Token= contextAccessor.HttpContext.Request.Headers["Authorization"];ObjResponse.Response="hai";ObjResponse.Status="haiee";stringUserId="1";if(Access_Token!=""){if(UserId!=""&&UserId!=null){if(ObjClsIntegration.CommonTokenVerification(UserId,Access_Token)!=""){
                            context.Succeed(requirement);}else{ObjResponse=ObjResponse.Get("_1011","Error",ObjListString.Cast<object>().ToList());// below  code not working properly in IIS .. its working fine in local host
                            contextAccessor.HttpContext.Response.WriteAsync(JsonConvert.SerializeObject(ObjResponse,newJsonSerializerSettings{Formatting=Formatting.Indented}));

                            context.Fail();}}else{

                        context.Fail();}}else{
                    context.Fail();}returnTask.CompletedTask;}catch(Exception ex){string filePath =@"Messages\Error.txt";//@"D:\Error.txt";using(StreamWriter writer =newStreamWriter(filePath,true)){
                    writer.WriteLine("Message :"+ ex.Message+"<br/>"+Environment.NewLine+"StackTrace :"+ ex.StackTrace+""+Environment.NewLine+"Date :"+DateTime.Now.ToString());
                    writer.WriteLine(Environment.NewLine+"-----------------------------------------------------------------------------"+Environment.NewLine);}throw ex;}}}}