diff --git a/client/src/lib/hooks/useConnection.ts b/client/src/lib/hooks/useConnection.ts
index 8639feeb..8d8fee46 100644
--- a/client/src/lib/hooks/useConnection.ts
+++ b/client/src/lib/hooks/useConnection.ts
@@ -777,6 +777,11 @@ export function useConnection({
           variant: "destructive",
         });
       }
+      toast({
+        title: "Connection error",
+        description: `Connection failed: "${e}"`,
+        variant: "destructive",
+      });
       console.error(e);
       setConnectionStatus("error");
     }
diff --git a/server/src/mcpProxy.ts b/server/src/mcpProxy.ts
index 664f1711..174eef0e 100644
--- a/server/src/mcpProxy.ts
+++ b/server/src/mcpProxy.ts
@@ -36,7 +36,9 @@ export default function mcpProxy({
           id: message.id,
           error: {
             code: -32001,
-            message: error.message,
+            message: error.cause
+              ? `${error.message} (cause: ${error.cause})`
+              : error.message,
             data: error,
           },
         };