diff --git a/autogen/coding/jupyter/base.py b/autogen/coding/jupyter/base.py
index d896b6ac3cc5..0e7acaf1e87b 100644
--- a/autogen/coding/jupyter/base.py
+++ b/autogen/coding/jupyter/base.py
@@ -10,9 +10,9 @@ class JupyterConnectionInfo:
     """`str` - Host of the Jupyter gateway server"""
     use_https: bool
     """`bool` - Whether to use HTTPS"""
-    port: int
-    """`int` - Port of the Jupyter gateway server"""
-    token: Optional[str]
+    port: Optional[int] = None
+    """`Optional[int]` - Port of the Jupyter gateway server. If None, the default port is used"""
+    token: Optional[str] = None
     """`Optional[str]` - Token for authentication. If None, no token is used"""
 
 
diff --git a/autogen/coding/jupyter/jupyter_client.py b/autogen/coding/jupyter/jupyter_client.py
index 44aafd8f5b09..b3de374fce9b 100644
--- a/autogen/coding/jupyter/jupyter_client.py
+++ b/autogen/coding/jupyter/jupyter_client.py
@@ -41,10 +41,12 @@ def _get_headers(self) -> Dict[str, str]:
 
     def _get_api_base_url(self) -> str:
         protocol = "https" if self._connection_info.use_https else "http"
-        return f"{protocol}://{self._connection_info.host}:{self._connection_info.port}"
+        port = f":{self._connection_info.port}" if self._connection_info.port else ""
+        return f"{protocol}://{self._connection_info.host}{port}"
 
     def _get_ws_base_url(self) -> str:
-        return f"ws://{self._connection_info.host}:{self._connection_info.port}"
+        port = f":{self._connection_info.port}" if self._connection_info.port else ""
+        return f"ws://{self._connection_info.host}{port}"
 
     def list_kernel_specs(self) -> Dict[str, Dict[str, str]]:
         response = self._session.get(f"{self._get_api_base_url()}/api/kernelspecs", headers=self._get_headers())