diff --git a/NAPS2.Escl.Server/EsclServer.cs b/NAPS2.Escl.Server/EsclServer.cs
index 502bd5d8d..34f6e1c7b 100644
--- a/NAPS2.Escl.Server/EsclServer.cs
+++ b/NAPS2.Escl.Server/EsclServer.cs
@@ -3,17 +3,12 @@ using EmbedIO.WebApi;
 
 namespace NAPS2.Escl.Server;
 
-public class EsclServer : IDisposable
+public class EsclServer : IEsclServer
 {
-    private readonly CancellationTokenSource _cts = new();
-    private readonly MdnsAdvertiser _advertiser;
     private readonly Dictionary<EsclDeviceConfig, CancellationTokenSource> _devices = new();
     private bool _started;
-
-    public EsclServer()
-    {
-        _advertiser = new MdnsAdvertiser();
-    }
+    private CancellationTokenSource? _cts;
+    private MdnsAdvertiser? _advertiser;
 
     public void AddDevice(EsclDeviceConfig deviceConfig)
     {
@@ -21,18 +16,23 @@ public class EsclServer : IDisposable
         {
             deviceConfig.Port = Port++;
         }
-        Task.Run(() => _advertiser.AdvertiseDevice(deviceConfig));
         _devices[deviceConfig] = new CancellationTokenSource();
         if (_started)
         {
             StartServer(deviceConfig);
+            var advertiser = _advertiser!;
+            Task.Run(() => advertiser.AdvertiseDevice(deviceConfig));
         }
     }
 
     public void RemoveDevice(EsclDeviceConfig deviceConfig)
     {
-        // TODO: Maybe enforce ordering to ensure we don't unadvertise before advertising?
-        Task.Run(() => _advertiser.UnadvertiseDevice(deviceConfig));
+        if (_started)
+        {
+            // TODO: Maybe enforce ordering to ensure we don't unadvertise before advertising?
+            var advertiser = _advertiser!;
+            Task.Run(() => advertiser.UnadvertiseDevice(deviceConfig));
+        }
         _devices[deviceConfig].Cancel();
         _devices.Remove(deviceConfig);
     }
@@ -47,10 +47,13 @@ public class EsclServer : IDisposable
             throw new InvalidOperationException();
         }
         _started = true;
+        _cts = new CancellationTokenSource();
+        _advertiser = new MdnsAdvertiser();
 
         foreach (var device in _devices.Keys)
         {
             StartServer(device);
+            Task.Run(() => _advertiser!.AdvertiseDevice(device));
         }
     }
 
@@ -64,7 +67,21 @@ public class EsclServer : IDisposable
                 .WithUrlPrefix(url))
             .WithWebApi("/eSCL", m => m.WithController(() => new EsclApiController(deviceConfig, serverState)));
         server.StateChanged += ServerOnStateChanged;
-        server.RunAsync(CancellationTokenSource.CreateLinkedTokenSource(_cts.Token, _devices[deviceConfig].Token).Token);
+        server.RunAsync(CancellationTokenSource.CreateLinkedTokenSource(_cts!.Token, _devices[deviceConfig].Token).Token);
+    }
+
+    public void Stop()
+    {
+        if (!_started)
+        {
+            throw new InvalidOperationException();
+        }
+        _started = false;
+
+        _cts!.Cancel();
+        _advertiser!.Dispose();
+        _cts = null;
+        _advertiser = null;
     }
 
     private void ServerOnStateChanged(object sender, WebServerStateChangedEventArgs e)
@@ -73,7 +90,9 @@ public class EsclServer : IDisposable
 
     public void Dispose()
     {
-        _cts.Cancel();
-        _advertiser.Dispose();
+        if (_started)
+        {
+            Stop();
+        }
     }
 }
\ No newline at end of file
diff --git a/NAPS2.Escl/Client/CapabilitiesParser.cs b/NAPS2.Escl/Client/CapabilitiesParser.cs
index 0b4539ed2..dc4fef57b 100644
--- a/NAPS2.Escl/Client/CapabilitiesParser.cs
+++ b/NAPS2.Escl/Client/CapabilitiesParser.cs
@@ -28,7 +28,7 @@ internal static class CapabilitiesParser
         var adfDuplexCapsEl = root.Element(ScanNs + "Adf")?.Element(ScanNs + "AdfDuplexInputCaps");
         return new EsclCapabilities
         {
-            Version = root.Element(PwgNs + "Version")?.Value,
+            Version = root.Element(PwgNs + "Version")?.Value ?? EsclCapabilities.DEFAULT_VERSION,
             MakeAndModel = root.Element(PwgNs + "MakeAndModel")?.Value,
             SerialNumber = root.Element(PwgNs + "SerialNumber")?.Value,
             Uuid = root.Element(ScanNs + "UUID")?.Value,
diff --git a/NAPS2.Escl/EsclCapabilities.cs b/NAPS2.Escl/EsclCapabilities.cs
index 7b11b19c1..61b94a380 100644
--- a/NAPS2.Escl/EsclCapabilities.cs
+++ b/NAPS2.Escl/EsclCapabilities.cs
@@ -2,7 +2,9 @@ namespace NAPS2.Escl;
 
 public class EsclCapabilities
 {
-    public string Version { get; init; } = "2.6";
+    public const string DEFAULT_VERSION = "2.6";
+
+    public string Version { get; init; } = DEFAULT_VERSION;
     public string? MakeAndModel { get; init; }
     public string? SerialNumber { get; init; }
     public string? Uuid { get; init; }
diff --git a/NAPS2.Escl.Server/EsclDeviceConfig.cs b/NAPS2.Escl/Server/EsclDeviceConfig.cs
similarity index 100%
rename from NAPS2.Escl.Server/EsclDeviceConfig.cs
rename to NAPS2.Escl/Server/EsclDeviceConfig.cs
diff --git a/NAPS2.Escl.Server/IEsclScanJob.cs b/NAPS2.Escl/Server/IEsclScanJob.cs
similarity index 100%
rename from NAPS2.Escl.Server/IEsclScanJob.cs
rename to NAPS2.Escl/Server/IEsclScanJob.cs
diff --git a/NAPS2.Escl/Server/IEsclServer.cs b/NAPS2.Escl/Server/IEsclServer.cs
new file mode 100644
index 000000000..af6518db3
--- /dev/null
+++ b/NAPS2.Escl/Server/IEsclServer.cs
@@ -0,0 +1,10 @@
+namespace NAPS2.Escl.Server;
+
+public interface IEsclServer : IDisposable
+{
+    void AddDevice(EsclDeviceConfig deviceConfig);
+    void RemoveDevice(EsclDeviceConfig deviceConfig);
+    int Port { get; set; }
+    void Start();
+    void Stop();
+}
\ No newline at end of file
diff --git a/NAPS2.Escl.Server/JobStatus.cs b/NAPS2.Escl/Server/JobStatus.cs
similarity index 100%
rename from NAPS2.Escl.Server/JobStatus.cs
rename to NAPS2.Escl/Server/JobStatus.cs
diff --git a/NAPS2.Lib/NAPS2.Lib.csproj b/NAPS2.Lib/NAPS2.Lib.csproj
index 02d546845..2062021f9 100644
--- a/NAPS2.Lib/NAPS2.Lib.csproj
+++ b/NAPS2.Lib/NAPS2.Lib.csproj
@@ -30,6 +30,7 @@
 
   <ItemGroup>
     <ProjectReference Include="..\NAPS2.Sdk\NAPS2.Sdk.csproj" />
+    <ProjectReference Include="..\NAPS2.Escl.Server\NAPS2.Escl.Server.csproj" />
     <PackageReference Include="Autofac" Version="7.1.0" />
     <PackageReference Include="Ben.Demystifier" Version="0.4.1" />
     <PackageReference Include="CommandLineParser" Version="2.9.1" />
diff --git a/NAPS2.Lib/Remoting/Server/SharedDeviceManager.cs b/NAPS2.Lib/Remoting/Server/SharedDeviceManager.cs
index 0d694eb4b..ef75042f9 100644
--- a/NAPS2.Lib/Remoting/Server/SharedDeviceManager.cs
+++ b/NAPS2.Lib/Remoting/Server/SharedDeviceManager.cs
@@ -1,3 +1,4 @@
+using NAPS2.Escl.Server;
 using NAPS2.Scan;
 
 namespace NAPS2.Remoting.Server;
@@ -10,7 +11,7 @@ public class SharedDeviceManager : ISharedDeviceManager
     public SharedDeviceManager(ScanningContext scanningContext, Naps2Config config)
     {
         _config = config;
-        _server = new ScanServer(scanningContext);
+        _server = new ScanServer(scanningContext, new EsclServer());
         _server.SetDefaultIcon(Icons.scanner_128);
         RegisterDevicesFromConfig();
     }
diff --git a/NAPS2.Sdk/NAPS2.Sdk.csproj b/NAPS2.Sdk/NAPS2.Sdk.csproj
index 6f85f8d7e..050083d71 100644
--- a/NAPS2.Sdk/NAPS2.Sdk.csproj
+++ b/NAPS2.Sdk/NAPS2.Sdk.csproj
@@ -86,7 +86,6 @@
   
   <ItemGroup>
     <ProjectReference Include="..\NAPS2.Escl\NAPS2.Escl.csproj" />
-    <ProjectReference Include="..\NAPS2.Escl.Server\NAPS2.Escl.Server.csproj" />
     <ProjectReference Include="..\NAPS2.Images.Mac\NAPS2.Images.Mac.csproj" Condition="'$(TargetFramework)' == 'net8-macos10.15'" />
     <ProjectReference Include="..\NAPS2.Images\NAPS2.Images.csproj" />
     <ProjectReference Include="..\NAPS2.Internals\NAPS2.Internals.csproj" />
diff --git a/NAPS2.Sdk/Remoting/Server/ScanServer.cs b/NAPS2.Sdk/Remoting/Server/ScanServer.cs
index 1fa1472ab..1c40ba55d 100644
--- a/NAPS2.Sdk/Remoting/Server/ScanServer.cs
+++ b/NAPS2.Sdk/Remoting/Server/ScanServer.cs
@@ -8,12 +8,13 @@ public class ScanServer : IDisposable
 {
     private readonly ScanningContext _scanningContext;
     private readonly Dictionary<(Driver, string), EsclDeviceConfig> _currentDevices = new();
-    private EsclServer? _esclServer;
+    private readonly IEsclServer _esclServer;
     private byte[]? _defaultIconPng;
 
-    public ScanServer(ScanningContext scanningContext)
+    public ScanServer(ScanningContext scanningContext, IEsclServer esclServer)
     {
         _scanningContext = scanningContext;
+        _esclServer = esclServer;
         ScanController = new ScanController(scanningContext);
     }
 
@@ -29,7 +30,7 @@ public class ScanServer : IDisposable
         var key = (device.Driver, device.Device.ID);
         var esclDeviceConfig = MakeEsclDeviceConfig(device);
         _currentDevices.Add(key, esclDeviceConfig);
-        _esclServer?.AddDevice(esclDeviceConfig);
+        _esclServer.AddDevice(esclDeviceConfig);
     }
 
     public void UnregisterDevice(SharedDevice device)
@@ -37,7 +38,7 @@ public class ScanServer : IDisposable
         var key = (device.Driver, device.Device.ID);
         var esclDeviceConfig = _currentDevices[key];
         _currentDevices.Remove(key);
-        _esclServer?.RemoveDevice(esclDeviceConfig);
+        _esclServer.RemoveDevice(esclDeviceConfig);
     }
 
     private EsclDeviceConfig MakeEsclDeviceConfig(SharedDevice device)
@@ -69,27 +70,9 @@ public class ScanServer : IDisposable
         };
     }
 
-    public void Start()
-    {
-        if (_esclServer != null) throw new InvalidOperationException("Already started");
-        _esclServer = new EsclServer();
-        foreach (var device in _currentDevices.Values)
-        {
-            _esclServer.AddDevice(device);
-        }
-        _esclServer.Start();
-    }
+    public void Start() => _esclServer.Start();
 
-    public void Stop()
-    {
-        if (_esclServer == null) throw new InvalidOperationException("Not started");
-        _esclServer.Dispose();
-        _esclServer = null;
-    }
+    public void Stop() => _esclServer.Stop();
 
-    public void Dispose()
-    {
-        _esclServer?.Dispose();
-        _esclServer = null;
-    }
+    public void Dispose() => _esclServer.Dispose();
 }
\ No newline at end of file