diff --git a/gns3server/api/routes/index.py b/gns3server/api/routes/index.py
index 365840b8c..23e859bc2 100644
--- a/gns3server/api/routes/index.py
+++ b/gns3server/api/routes/index.py
@@ -36,7 +36,7 @@ async def root():
 @router.get("/debug", response_class=HTMLResponse, deprecated=True, include_in_schema=False)
 def debug(request: Request):
 
-    kwargs = {"gns3_version": __version__, "gns3_host": request.client.host}
+    kwargs = {"gns3_version": __version__, "gns3_host": request.client.host if request.client else None}
     return templates.TemplateResponse(request=request, name="index.html", context=kwargs)
 
 
diff --git a/gns3server/config.py b/gns3server/config.py
index 0baf2fe2f..ed1507f4e 100644
--- a/gns3server/config.py
+++ b/gns3server/config.py
@@ -48,6 +48,10 @@ class ConfigConflictError(Exception):
 LIST_OPTION_SEPARATORS = {"additional_images_paths": ";"}
 
 
+def parser_sections(parser: configparser.ConfigParser) -> dict[str, dict[str, str]]:
+    return {section: dict(parser[section]) for section in parser.sections()}
+
+
 class Config:
     """
     Configuration file management using configparser.
@@ -328,7 +332,7 @@ class Config:
                 changed.append(f"{section}.{option}")
 
         # validate the merged settings before touching the file on disk
-        ServerConfig(**merged_parser._sections)
+        ServerConfig(**parser_sections(merged_parser))
 
         directory_name = os.path.dirname(main_config_file)
         if directory_name:
@@ -414,7 +418,7 @@ class Config:
             self._watched_files[file] = os.stat(file).st_mtime
 
         try:
-            self._settings = ServerConfig(**config._sections)
+            self._settings = ServerConfig(**parser_sections(config))
         except ValidationError as e:
             log.critical(f"Could not validate configuration file settings: {e}")
             raise
diff --git a/gns3server/utils/asyncio/embed_shell.py b/gns3server/utils/asyncio/embed_shell.py
index 3efd0bdbc..7059c9e29 100644
--- a/gns3server/utils/asyncio/embed_shell.py
+++ b/gns3server/utils/asyncio/embed_shell.py
@@ -236,12 +236,11 @@ class ShellConnection(TelnetConnection):
     async def disconnected(self):
         pass
 
-    @asyncio.coroutine
-    def window_size_changed(self, columns, rows):
+    async def window_size_changed(self, columns, rows):
         self._size = Size(rows=rows, columns=columns)
         self._cb.terminal_size_changed()
         if self._window_size_changed_callback:
-            yield from self._window_size_changed_callback(columns, rows)
+            await self._window_size_changed_callback(columns, rows)
 
     async def feed(self, data):
         data = data.decode()
diff --git a/pyproject.toml b/pyproject.toml
index cbf8d4d6a..2f7dba02a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -359,7 +359,6 @@ module = [
   "gns3server.api.routes.controller.snapshots",  # 1
   "gns3server.api.routes.controller.templates",  # 10
   "gns3server.api.routes.controller.users",  # 14
-  "gns3server.api.routes.index",  # 1
   "gns3server.api.server",  # 2
   "gns3server.compute.docker.docker_vm",  # 3
   "gns3server.compute.docker.iol_docker_vm",  # 3
@@ -371,7 +370,6 @@ module = [
   "gns3server.compute.virtualbox.virtualbox_vm",  # 1
   "gns3server.compute.vmware.vmware_vm",  # 1
   "gns3server.compute.vpcs.vpcs_vm",  # 2
-  "gns3server.config",  # 1
   "gns3server.controller.appliance",  # 2
   "gns3server.controller.appliance_manager",  # 5
   "gns3server.controller.compute",  # 2
@@ -420,7 +418,6 @@ module = [
   "gns3server.services.computes",  # 4
   "gns3server.services.templates",  # 18
   "gns3server.utils.asyncio.aiozipstream",  # 8
-  "gns3server.utils.asyncio.embed_shell",  # 1
   "gns3server.utils.encryption",  # 2
   "gns3server.utils.http_client",  # 4
   "gns3server.utils.images",  # 4