diff --git a/ApiDto/Responses/ErrorResponse.cs b/ApiDto/Responses/ErrorResponse.cs
deleted file mode 100644
index f0dc33c..0000000
--- a/ApiDto/Responses/ErrorResponse.cs
+++ /dev/null
@@ -1,22 +0,0 @@
-using System.ComponentModel.DataAnnotations;
-
-namespace Mirea.Api.Dto.Responses;
-
-/// <summary>
-/// A class for providing information about an error
-/// </summary>
-public class ErrorResponse
-{
-    /// <summary>
-    /// The text or translation code of the error. This field may not contain information in specific scenarios.
-    /// For example, it might be empty for HTTP 204 responses where no content is returned or if the validation texts have not been configured.
-    /// </summary>
-    [Required]
-    public required string Error { get; set; }
-    /// <summary>
-    /// In addition to returning the response code in the header, it is also duplicated in this field.
-    /// Represents the HTTP response code.
-    /// </summary>
-    [Required]
-    public required int Code { get; set; }
-}
\ No newline at end of file
diff --git a/Endpoint/Common/Attributes/BadRequestResponseAttribute.cs b/Endpoint/Common/Attributes/BadRequestResponseAttribute.cs
index 85f9ed8..b424733 100644
--- a/Endpoint/Common/Attributes/BadRequestResponseAttribute.cs
+++ b/Endpoint/Common/Attributes/BadRequestResponseAttribute.cs
@@ -1,9 +1,8 @@
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Mvc;
-using Mirea.Api.Dto.Responses;
 using System;
 
 namespace Mirea.Api.Endpoint.Common.Attributes;
 
 [AttributeUsage(AttributeTargets.Method, Inherited = false, AllowMultiple = true)]
-public class BadRequestResponseAttribute() : ProducesResponseTypeAttribute(typeof(ErrorResponse), StatusCodes.Status400BadRequest);
\ No newline at end of file
+public class BadRequestResponseAttribute() : ProducesResponseTypeAttribute(typeof(ProblemDetails), StatusCodes.Status400BadRequest);
\ No newline at end of file
diff --git a/Endpoint/Common/Attributes/NotFoundResponseAttribute.cs b/Endpoint/Common/Attributes/NotFoundResponseAttribute.cs
index 39527ea..7b5855f 100644
--- a/Endpoint/Common/Attributes/NotFoundResponseAttribute.cs
+++ b/Endpoint/Common/Attributes/NotFoundResponseAttribute.cs
@@ -1,9 +1,8 @@
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Mvc;
-using Mirea.Api.Dto.Responses;
 using System;
 
 namespace Mirea.Api.Endpoint.Common.Attributes;
 
 [AttributeUsage(AttributeTargets.Method, Inherited = false, AllowMultiple = true)]
-public class NotFoundResponseAttribute() : ProducesResponseTypeAttribute(typeof(ErrorResponse), StatusCodes.Status404NotFound);
\ No newline at end of file
+public class NotFoundResponseAttribute() : ProducesResponseTypeAttribute(typeof(ProblemDetails), StatusCodes.Status404NotFound);
\ No newline at end of file
diff --git a/Endpoint/Configuration/Core/Middleware/CustomExceptionHandlerMiddleware.cs b/Endpoint/Configuration/Core/Middleware/CustomExceptionHandlerMiddleware.cs
index d5aff77..3c65dd8 100644
--- a/Endpoint/Configuration/Core/Middleware/CustomExceptionHandlerMiddleware.cs
+++ b/Endpoint/Configuration/Core/Middleware/CustomExceptionHandlerMiddleware.cs
@@ -1,10 +1,13 @@
 using FluentValidation;
 using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
 using Microsoft.Extensions.Logging;
 using Mirea.Api.DataAccess.Application.Common.Exceptions;
-using Mirea.Api.Dto.Responses;
 using Mirea.Api.Endpoint.Common.Exceptions;
 using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
 using System.Security;
 using System.Text.Json;
 using System.Threading.Tasks;
@@ -27,50 +30,55 @@ public class CustomExceptionHandlerMiddleware(RequestDelegate next, ILogger<Cust
 
     private Task HandleExceptionAsync(HttpContext context, Exception exception)
     {
-        var code = StatusCodes.Status500InternalServerError;
-        var result = string.Empty;
+        var traceId = Activity.Current?.Id ?? context.TraceIdentifier;
+
+        var problemDetails = new ProblemDetails
+        {
+            Type = "https://tools.ietf.org/html/rfc9110#section-15.6",
+            Title = "An unexpected error occurred.",
+            Status = StatusCodes.Status500InternalServerError,
+            Detail = exception.Message,
+            Extensions = new Dictionary<string, object?>()
+            {
+                { "traceId", traceId }
+            }
+        };
+
         switch (exception)
         {
             case ValidationException validationException:
-                code = StatusCodes.Status400BadRequest;
-                result = JsonSerializer.Serialize(new ErrorResponse()
+                problemDetails.Status = StatusCodes.Status400BadRequest;
+                problemDetails.Type = "https://tools.ietf.org/html/rfc9110#section-15.5.1";
+                problemDetails.Title = "Validation errors occurred.";
+                problemDetails.Extensions = new Dictionary<string, object?>
                 {
-                    Error = validationException.Message,
-                    Code = code
-                });
+                    { "errors", validationException.Errors.Select(e => e.ErrorMessage).ToArray() },
+                    { "traceId", traceId }
+                };
                 break;
             case NotFoundException:
-                code = StatusCodes.Status404NotFound;
+                problemDetails.Status = StatusCodes.Status404NotFound;
+                problemDetails.Type = "https://tools.ietf.org/html/rfc9110#section-15.5.4";
+                problemDetails.Title = "Resource not found.";
                 break;
             case ControllerArgumentException:
-                code = StatusCodes.Status400BadRequest;
+                problemDetails.Status = StatusCodes.Status400BadRequest;
+                problemDetails.Type = "https://tools.ietf.org/html/rfc9110#section-15.5.1";
+                problemDetails.Title = "Invalid arguments provided.";
                 break;
             case SecurityException:
-                code = StatusCodes.Status401Unauthorized;
+                problemDetails.Status = StatusCodes.Status401Unauthorized;
+                problemDetails.Type = "https://tools.ietf.org/html/rfc9110#section-15.5.2";
+                problemDetails.Title = "Unauthorized access.";
                 break;
         }
 
-        context.Response.ContentType = "application/json";
-        context.Response.StatusCode = code;
-
-        if (!string.IsNullOrEmpty(result))
-            return context.Response.WriteAsync(result);
-
-        string error;
-        if (code == StatusCodes.Status500InternalServerError)
-        {
-            error = "Internal Server Error";
+        if (problemDetails.Status == StatusCodes.Status500InternalServerError)
             logger.LogError(exception, "Internal server error when processing the request");
-        }
-        else
-            error = exception.Message;
 
-        result = JsonSerializer.Serialize(new ErrorResponse()
-        {
-            Error = error,
-            Code = code
-        });
+        context.Response.ContentType = "application/json";
+        context.Response.StatusCode = problemDetails.Status.Value;
 
-        return context.Response.WriteAsync(result);
+        return context.Response.WriteAsync(JsonSerializer.Serialize(problemDetails));
     }
 }
\ No newline at end of file
diff --git a/Endpoint/Configuration/Core/Startup/LoggerConfiguration.cs b/Endpoint/Configuration/Core/Startup/LoggerConfiguration.cs
index da000b1..2e10259 100644
--- a/Endpoint/Configuration/Core/Startup/LoggerConfiguration.cs
+++ b/Endpoint/Configuration/Core/Startup/LoggerConfiguration.cs
@@ -4,9 +4,11 @@ using Microsoft.Extensions.Hosting;
 using Mirea.Api.Endpoint.Common.Services;
 using Mirea.Api.Endpoint.Configuration.Model;
 using Serilog;
+using Serilog.Context;
 using Serilog.Events;
 using Serilog.Filters;
 using Serilog.Formatting.Compact;
+using System.Diagnostics;
 using System.IO;
 
 namespace Mirea.Api.Endpoint.Configuration.Core.Startup;
@@ -55,7 +57,14 @@ public static class LoggerConfiguration
 
     public static IApplicationBuilder UseCustomSerilog(this IApplicationBuilder app)
     {
-        return app.UseSerilogRequestLogging(options =>
+        return app.Use(async (context, next) =>
+        {
+            var traceId = Activity.Current?.Id ?? context.TraceIdentifier;
+            using (LogContext.PushProperty("TraceId", traceId))
+            {
+                await next();
+            }
+        }).UseSerilogRequestLogging(options =>
         {
             options.MessageTemplate = "[{RequestMethod}] {RequestPath} [Client {RemoteIPAddress}] [{StatusCode}] in {Elapsed:0.0000} ms";
 
diff --git a/Endpoint/Controllers/Configuration/SetupController.cs b/Endpoint/Controllers/Configuration/SetupController.cs
index e1780f2..5ab4671 100644
--- a/Endpoint/Controllers/Configuration/SetupController.cs
+++ b/Endpoint/Controllers/Configuration/SetupController.cs
@@ -30,6 +30,7 @@ using System.IO;
 using System.Linq;
 using System.Net.Mail;
 using System.Runtime.InteropServices;
+using System.Security;
 using System.Security.Cryptography;
 using PasswordPolicy = Mirea.Api.Dto.Common.PasswordPolicy;
 
@@ -88,7 +89,7 @@ public class SetupController(
         }
 
         if (!setupToken.MatchToken(tokenBase64))
-            return Unauthorized("The token is not valid");
+            throw new SecurityException("The token is not valid");
 
         Response.Cookies.Append(TokenAuthenticationAttribute.AuthToken, token, new CookieOptions
         {
diff --git a/Endpoint/Controllers/V1/AuthController.cs b/Endpoint/Controllers/V1/AuthController.cs
index 529b29a..3c26de0 100644
--- a/Endpoint/Controllers/V1/AuthController.cs
+++ b/Endpoint/Controllers/V1/AuthController.cs
@@ -15,6 +15,7 @@ using Mirea.Api.Security.Common.Domain;
 using Mirea.Api.Security.Services;
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Security.Claims;
 using System.Threading.Tasks;
 using OAuthProvider = Mirea.Api.Security.Common.Domain.OAuthProvider;
@@ -31,17 +32,17 @@ public class AuthController(IOptionsSnapshot<Admin> user, IOptionsSnapshot<Gener
             Path = UrlHelper.GetSubPathWithoutFirstApiName + "api"
         };
 
-    private static string GenerateHtmlResponse(string title, string message, OAuthProvider? provider, bool isError = false)
+    private static string GenerateHtmlResponse(string title, string message, OAuthProvider? provider, bool isError = false, string? traceId = null)
     {
         string messageColor = isError ? "red" : "white";
         string script = "<script>setTimeout(()=>{if(window.opener){window.opener.postMessage(" +
-                        "{success:" + !isError +
+                        "{success:" + (!isError).ToString().ToLower() +
                         ",provider:'" + (provider == null ? "null" : (int)provider) +
                         "',providerName:'" + (provider == null ? "null" : Enum.GetName(provider.Value)) +
                         "',message:'" + message.Replace("'", "\\'") +
-                        "'},'*');}window.close();}, 5000);</script>";
+                        "'},'*');}window.close();}, 15000);</script>";
 
-        return $"<!DOCTYPE html><html lang=ru><head><meta charset=UTF-8><meta content=\"width=device-width,initial-scale=1\"name=viewport><link href=\"https://fonts.googleapis.com/css2?family=Roboto:wght@400;700&display=swap\"rel=stylesheet><style>body{{background-color:#121212;color:#fff;font-family:Roboto,sans-serif;display:flex;justify-content:center;align-items:center;height:100vh;margin:0;text-align:center}}.container{{max-width:600px;padding:20px;border-radius:8px;background-color:#1e1e1e;box-shadow:0 4px 20px rgba(0,0,0,.5)}}h1{{font-size:24px;margin-bottom:20px}}p{{font-size:16px;color:{messageColor}}}</style><title>{title}</title></head><body><div class=container><h1>{title}</h1><p>{message}<p style=font-size:14px;color:silver;>Это информационная страница. Вы можете закрыть её.</div>{script}</body></html>";
+        return $"<!DOCTYPE html><html lang=ru><head><meta charset=UTF-8><meta content=\"width=device-width,initial-scale=1\"name=viewport><link href=\"https://fonts.googleapis.com/css2?family=Roboto:wght@400;700&display=swap\"rel=stylesheet><style>body{{background-color:#121212;color:#fff;font-family:Roboto,sans-serif;display:flex;justify-content:center;align-items:center;height:100vh;margin:0;text-align:center}}.container{{max-width:600px;padding:20px;border-radius:8px;background-color:#1e1e1e;box-shadow:0 4px 20px rgba(0,0,0,.5)}}h1{{font-size:24px;margin-bottom:20px}}p{{font-size:16px;color:{messageColor}}}</style><title>{title}</title></head><body><div class=container><h1>{title}</h1><p>{message}</p><p style=font-size:14px;color:silver;>Это информационная страница. Вы можете закрыть её.</p>{(!string.IsNullOrEmpty(traceId) ? $"<code style=font-size:12px;color:gray;>TraceId={traceId}</code>" : string.Empty)}</div>{script}</body></html>";
     }
 
     [HttpGet("OAuth2")]
@@ -56,6 +57,7 @@ public class AuthController(IOptionsSnapshot<Admin> user, IOptionsSnapshot<Gener
         string message;
         OAuthProvider provider;
         OAuthUser oAuthUser;
+        var traceId = Activity.Current?.Id ?? HttpContext.TraceIdentifier;
 
         try
         {
@@ -66,7 +68,7 @@ public class AuthController(IOptionsSnapshot<Admin> user, IOptionsSnapshot<Gener
         {
             title = "Произошла ошибка при общении с провайдером OAuth!";
             message = e.Message;
-            return Content(GenerateHtmlResponse(title, message, null, true), "text/html");
+            return Content(GenerateHtmlResponse(title, message, null, true, traceId), "text/html");
         }
 
         var userEntity = user.Value;
@@ -79,7 +81,7 @@ public class AuthController(IOptionsSnapshot<Admin> user, IOptionsSnapshot<Gener
             {
                 title = "Ошибка связи аккаунта!";
                 message = "Этот OAuth провайдер уже связан с вашей учетной записью. Пожалуйста, используйте другого провайдера или удалите связь с аккаунтом.";
-                return Content(GenerateHtmlResponse(title, message, provider, true), "text/html");
+                return Content(GenerateHtmlResponse(title, message, provider, true, traceId), "text/html");
             }
 
             userEntity.SaveSetting();
diff --git a/Endpoint/Controllers/V1/ProfessorController.cs b/Endpoint/Controllers/V1/ProfessorController.cs
index 722fa8c..989105a 100644
--- a/Endpoint/Controllers/V1/ProfessorController.cs
+++ b/Endpoint/Controllers/V1/ProfessorController.cs
@@ -81,7 +81,7 @@ public class ProfessorController(IMediator mediator) : BaseController
     public async Task<ActionResult<List<ProfessorResponse>>> GetDetails(string name)
     {
         if (string.IsNullOrEmpty(name) || name.Length < 4)
-            return BadRequest($"The minimum number of characters is 4 (current: {name.Length}).");
+            throw new ControllerArgumentException($"The minimum number of characters is 4 (current: {name.Length}).");
 
         var result = await mediator.Send(new GetProfessorInfoSearchQuery()
         {
diff --git a/Endpoint/Controllers/V1/ScheduleController.cs b/Endpoint/Controllers/V1/ScheduleController.cs
index 55a7f03..00baf6e 100644
--- a/Endpoint/Controllers/V1/ScheduleController.cs
+++ b/Endpoint/Controllers/V1/ScheduleController.cs
@@ -8,6 +8,7 @@ using Mirea.Api.Dto.Common;
 using Mirea.Api.Dto.Requests;
 using Mirea.Api.Dto.Responses;
 using Mirea.Api.Endpoint.Common.Attributes;
+using Mirea.Api.Endpoint.Common.Exceptions;
 using Mirea.Api.Endpoint.Common.MapperDto;
 using Mirea.Api.Endpoint.Configuration.Model;
 using System;
@@ -52,14 +53,10 @@ public class ScheduleController(IMediator mediator, IOptionsSnapshot<GeneralConf
             (request.Professors == null || request.Professors.Length == 0) &&
             (request.LectureHalls == null || request.LectureHalls.Length == 0))
         {
-            return BadRequest(new ErrorResponse()
-            {
-                Error = "At least one of the arguments must be selected."
-                        + (request.IsEven.HasValue
-                            ? $" \"{nameof(request.IsEven)}\" is not a strong argument"
-                            : string.Empty),
-                Code = StatusCodes.Status400BadRequest
-            });
+            throw new ControllerArgumentException("At least one of the arguments must be selected."
+                              + (request.IsEven.HasValue
+                                  ? $" \"{nameof(request.IsEven)}\" is not a strong argument"
+                                  : string.Empty));
         }
 
         var result = (await mediator.Send(new GetScheduleListQuery
diff --git a/Endpoint/Controllers/V1/SecurityController.cs b/Endpoint/Controllers/V1/SecurityController.cs
index 5889acb..4024d71 100644
--- a/Endpoint/Controllers/V1/SecurityController.cs
+++ b/Endpoint/Controllers/V1/SecurityController.cs
@@ -3,6 +3,7 @@ using Microsoft.AspNetCore.Mvc;
 using Microsoft.Extensions.Options;
 using Mirea.Api.Dto.Common;
 using Mirea.Api.Endpoint.Common.Attributes;
+using Mirea.Api.Endpoint.Common.Exceptions;
 using Mirea.Api.Endpoint.Common.MapperDto;
 using Mirea.Api.Endpoint.Configuration.Model;
 using QRCoder;
@@ -68,7 +69,7 @@ public class SecurityController(IOptionsSnapshot<GeneralConfig> generalConfig) :
         }
         catch (Exception ex)
         {
-            return BadRequest($"Failed to generate QR code: {ex.Message}");
+            throw new ControllerArgumentException($"Failed to generate QR code: {ex.Message}");
         }
     }