diff --git a/src/main/java/dev/dinauer/oidcproxy/Resource.java b/src/main/java/dev/dinauer/oidcproxy/Resource.java
index f54b99b..7d6d542 100644
--- a/src/main/java/dev/dinauer/oidcproxy/Resource.java
+++ b/src/main/java/dev/dinauer/oidcproxy/Resource.java
@@ -6,6 +6,7 @@ import dev.dinauer.oidcproxy.proxy.ForwardService;
 import dev.dinauer.oidcproxy.proxy.ResponseHandler;
 import dev.dinauer.oidcproxy.proxy.TimedHttpResponse;
 import dev.dinauer.oidcproxy.proxy.exception.ProxyHttpException;
+import dev.dinauer.oidcproxy.proxy.exception.SessionNotFoundException;
 import dev.dinauer.oidcproxy.proxy.exception.TokenNotFoundException;
 import dev.dinauer.oidcproxy.startup.PathConverter;
 import dev.dinauer.oidcproxy.startup.ProxyRoute;
@@ -89,9 +90,9 @@ public class Resource
             accessLog.log(AccessLog.Type.ERROR, context, PathConverter.toPath(requestSegments), route.target(), e.getStatusCode(), e.getTime());
             ResponseHandler.error(context, e.getStatusCode());
         }
-        catch (TokenNotFoundException e)
+        catch (TokenNotFoundException | SessionNotFoundException e)
         {
-            LOG.error("Token not found.", e);
+            LOG.error("Token / Session not found.", e);
             ResponseHandler.error(context, 401);
         }
         catch (InterruptedException e)
diff --git a/src/main/java/dev/dinauer/oidcproxy/proxy/ForwardService.java b/src/main/java/dev/dinauer/oidcproxy/proxy/ForwardService.java
index 158b23c..19e4e84 100644
--- a/src/main/java/dev/dinauer/oidcproxy/proxy/ForwardService.java
+++ b/src/main/java/dev/dinauer/oidcproxy/proxy/ForwardService.java
@@ -1,6 +1,7 @@
 package dev.dinauer.oidcproxy.proxy;
 
 import dev.dinauer.oidcproxy.proxy.exception.ProxyHttpException;
+import dev.dinauer.oidcproxy.proxy.exception.SessionNotFoundException;
 import dev.dinauer.oidcproxy.proxy.exception.TokenNotFoundException;
 import dev.dinauer.oidcproxy.session.SessionCache;
 import dev.dinauer.oidcproxy.proxy.header.HeaderFilter;
@@ -23,7 +24,7 @@ public class ForwardService
     @Inject
     HeaderFilter headerFilter;
 
-    public TimedHttpResponse<byte[]> send(RoutingContext context, String route, String strategy) throws IOException, InterruptedException, ProxyHttpException, TokenNotFoundException
+    public TimedHttpResponse<byte[]> send(RoutingContext context, String route, String strategy) throws IOException, InterruptedException, ProxyHttpException, TokenNotFoundException, SessionNotFoundException
     {
         HttpRequestBuilder builder = HttpRequestBuilder.create();
         builder.setUri(route);
diff --git a/src/main/java/dev/dinauer/oidcproxy/proxy/exception/SessionNotFoundException.java b/src/main/java/dev/dinauer/oidcproxy/proxy/exception/SessionNotFoundException.java
new file mode 100644
index 0000000..a769561
--- /dev/null
+++ b/src/main/java/dev/dinauer/oidcproxy/proxy/exception/SessionNotFoundException.java
@@ -0,0 +1,8 @@
+package dev.dinauer.oidcproxy.proxy.exception;
+
+public class SessionNotFoundException extends Exception
+{
+    public SessionNotFoundException()
+    {
+    }
+}
diff --git a/src/main/java/dev/dinauer/oidcproxy/proxy/header/HeaderFilter.java b/src/main/java/dev/dinauer/oidcproxy/proxy/header/HeaderFilter.java
index 73a5143..f448a00 100644
--- a/src/main/java/dev/dinauer/oidcproxy/proxy/header/HeaderFilter.java
+++ b/src/main/java/dev/dinauer/oidcproxy/proxy/header/HeaderFilter.java
@@ -1,5 +1,6 @@
 package dev.dinauer.oidcproxy.proxy.header;
 
+import dev.dinauer.oidcproxy.proxy.exception.SessionNotFoundException;
 import dev.dinauer.oidcproxy.proxy.exception.TokenNotFoundException;
 import dev.dinauer.oidcproxy.proxy.header.strategy.OidcStrategy;
 import dev.dinauer.oidcproxy.session.SessionCache;
@@ -21,7 +22,7 @@ public class HeaderFilter
     @Inject
     OidcStrategy oidcStrategy;
 
-    public List<Map.Entry<String, String>> filter(HttpServerRequest request, String strategy) throws TokenNotFoundException
+    public List<Map.Entry<String, String>> filter(HttpServerRequest request, String strategy) throws TokenNotFoundException, SessionNotFoundException
     {
         List<Map.Entry<String, String>> headers = filterHop2HopHeaders(request.headers().entries());
         if ("OIDC".equals(strategy))
diff --git a/src/main/java/dev/dinauer/oidcproxy/proxy/header/strategy/OidcStrategy.java b/src/main/java/dev/dinauer/oidcproxy/proxy/header/strategy/OidcStrategy.java
index 353a457..b610d0c 100644
--- a/src/main/java/dev/dinauer/oidcproxy/proxy/header/strategy/OidcStrategy.java
+++ b/src/main/java/dev/dinauer/oidcproxy/proxy/header/strategy/OidcStrategy.java
@@ -1,5 +1,6 @@
 package dev.dinauer.oidcproxy.proxy.header.strategy;
 
+import dev.dinauer.oidcproxy.proxy.exception.SessionNotFoundException;
 import dev.dinauer.oidcproxy.proxy.exception.TokenNotFoundException;
 import dev.dinauer.oidcproxy.session.SessionCache;
 import io.quarkus.security.UnauthorizedException;
@@ -21,7 +22,7 @@ public class OidcStrategy
     @Inject
     SessionCache sessionCache;
 
-    public List<Map.Entry<String, String>> filter(HttpServerRequest request, List<Map.Entry<String, String>> input) throws TokenNotFoundException
+    public List<Map.Entry<String, String>> filter(HttpServerRequest request, List<Map.Entry<String, String>> input) throws TokenNotFoundException, SessionNotFoundException
     {
         if (!hasAuthHeader(input))
         {
@@ -30,7 +31,7 @@ public class OidcStrategy
         return input;
     }
 
-    private String getAccessToken(HttpServerRequest request) throws TokenNotFoundException
+    private String getAccessToken(HttpServerRequest request) throws TokenNotFoundException, SessionNotFoundException
     {
         for (Cookie cookie : request.cookies())
         {
@@ -40,7 +41,7 @@ public class OidcStrategy
                 return sessionCache.get(session);
             }
         }
-        throw new UnauthorizedException();
+        throw new SessionNotFoundException();
     }
 
     private boolean hasAuthHeader(List<Map.Entry<String, String>> input)