diff --git a/.gitignore b/.gitignore
index 49bc29c..f96e9df 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,4 @@
 bin/*
 obj/*
+logs/*
+Elmah/*
diff --git a/Berufsschule_HAM.csproj b/Berufsschule_HAM.csproj
index e009cd5..0318cad 100644
--- a/Berufsschule_HAM.csproj
+++ b/Berufsschule_HAM.csproj
@@ -5,7 +5,10 @@
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
   <ItemGroup>
+    <PackageReference Include="ElmahCore" Version="2.1.2" />
     <PackageReference Include="Novell.Directory.Ldap" Version="2.2.1" />
+    <PackageReference Include="Serilog" Version="4.3.0" />
+    <PackageReference Include="Serilog.AspNetCore" Version="9.0.0" />
     <PackageReference Include="Swashbuckle.AspNetCore" Version="9.0.4" />
     <PackageReference Include="Swashbuckle.AspNetCore.SwaggerGen" Version="9.0.4" />
     <PackageReference Include="Swashbuckle.AspNetCore.SwaggerUI" Version="9.0.4" />
diff --git a/Program.cs b/Program.cs
index 74fa2ab..48b9929 100644
--- a/Program.cs
+++ b/Program.cs
@@ -1,42 +1,13 @@
-// var builder = WebApplication.CreateBuilder(args);
-
-// // Add services to the container.
-// builder.Services.AddControllersWithViews();
-
-// var app = builder.Build();
-
-// // Configure the HTTP request pipeline.
-// if (!app.Environment.IsDevelopment())
-// {
-//     app.UseExceptionHandler("/Home/Error");
-//     // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
-//     app.UseHsts();
-// }
-
-// app.UseHttpsRedirection();
-// app.UseRouting();
-
-// app.UseAuthorization();
-
-// app.MapStaticAssets();
-
-// app.MapControllerRoute(
-//     name: "default",
-//     pattern: "{controller=Home}/{action=Index}/{id?}")
-//     .WithStaticAssets();
-
-
-// app.Run();
-
+using ElmahCore;
+using ElmahCore.Mvc;
+using Serilog;
 using Berufsschule_HAM.Services;
-
 var builder = WebApplication.CreateBuilder(args);
 
 // Bind options
 builder.Services.Configure<LdapOptions>(builder.Configuration.GetSection("Ldap"));
 
 // Register LDAP service as singleton (it manages its own connection)
-builder.Services.AddSingleton<LdapService>();
 
 
 builder.Services.AddControllersWithViews();
@@ -44,6 +15,18 @@ builder.Services.AddControllersWithViews();
 builder.Services.AddEndpointsApiExplorer();
 builder.Services.AddSwaggerGen();
 
+Log.Logger = new LoggerConfiguration()
+    .ReadFrom.Configuration(builder.Configuration)
+    .CreateLogger();
+builder.Services.AddSerilog();
+
+builder.Services.AddElmah<XmlFileErrorLog>(Options =>
+{
+    Options.LogPath = builder.Configuration.GetValue<string>("Elmah:LogFolder") ?? "~/logs";
+});
+
+builder.Services.AddSingleton<LdapService>();
+
 var app = builder.Build();
 
 if (!app.Environment.IsDevelopment())
@@ -51,7 +34,7 @@ if (!app.Environment.IsDevelopment())
     app.UseExceptionHandler("/Home/Error");
 }
 
-//app.MapSwagger();
+app.UseElmah();
 app.UseSwagger();
 app.UseSwaggerUI();
 
diff --git a/Services/LdapService.cs b/Services/LdapService.cs
index 95ed308..16f3ef0 100644
--- a/Services/LdapService.cs
+++ b/Services/LdapService.cs
@@ -12,11 +12,13 @@ public class LdapService : IDisposable
 {
     private readonly LdapOptions _opts;
     private readonly LdapConnection _conn;
+    private ILogger _logger;
 
-    public LdapService(IOptions<LdapOptions> options)
+    public LdapService(IOptions<LdapOptions> options, ILogger<LdapService> logger)
     {
         _opts = options.Value;
         _conn = new LdapConnection { SecureSocketLayer = _opts.UseSsl };
+        _logger = logger;
         ConnectAndBind();
     }
 
@@ -26,7 +28,15 @@ public class LdapService : IDisposable
         {
             Console.WriteLine(_opts.Host);
             Console.WriteLine(_opts.Port);
-            _conn.Connect(_opts.Host, _opts.Port);
+            try
+            {
+                _conn.Connect(_opts.Host, _opts.Port);
+            }
+            catch (SystemException ex)
+            {
+                _logger.LogCritical("Unable to connect to LDAP: {ex.Message}\n{ex.StackTrace}", [ex.Message, ex.StackTrace]);
+                throw;
+            }
         }
         _conn.Bind(_opts.BindDn, _opts.BindPassword);
     }
diff --git a/appsettings.json b/appsettings.json
index 79455a2..f003816 100644
--- a/appsettings.json
+++ b/appsettings.json
@@ -5,6 +5,24 @@
       "Microsoft.AspNetCore": "Warning"
     }
   },
+  "Serilog": {
+    "Using":  [ "Serilog.Sinks.Console", "Serilog.Sinks.File" ],
+    "MinimumLevel": "Information",
+    "WriteTo": [
+      { "Name": "Console" },
+      { "Name": "File", "Args": { "path": "logs/log.txt", "rollingInterval": "Day", "retainedFileCountLimit": 7 } }
+    ],
+    "Properties": {
+        "Application": "Embeddingsearch.Indexer"
+    }
+  },
+  "Elmah": {
+      "AllowedHosts": [
+        "127.0.0.1",
+        "::1"
+      ],
+      "LogFolder": "./Elmah"
+  },
   "AllowedHosts": "*",
   "Ldap": {
     "Host": "ld50.dev",