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/compute/docker/docker_vm.py b/gns3server/compute/docker/docker_vm.py
index 7d557dff2..08559b990 100644
--- a/gns3server/compute/docker/docker_vm.py
+++ b/gns3server/compute/docker/docker_vm.py
@@ -227,7 +227,11 @@ class DockerVM(BaseNode):
                 return display
             display += 1
 
-    @BaseNode.name.setter
+    @property
+    def name(self):
+        return self._name
+
+    @name.setter
     def name(self, new_name):
         """
         Sets the name of this Qemu VM.
@@ -737,13 +741,15 @@ class DockerVM(BaseNode):
             params["Env"].append("{}={}".format(var_name, formatted))
 
         if self._environment:
-            for e in self._environment.strip().split("\n"):
-                e = e.strip()
-                if e.split("=")[0] == "":
-                    self.project.emit("log.warning", {"message": f"{self.name} has invalid environment variable: {e}"})
+            for env in self._environment.strip().split("\n"):
+                env = env.strip()
+                if env.split("=")[0] == "":
+                    self.project.emit(
+                        "log.warning", {"message": f"{self.name} has invalid environment variable: {env}"}
+                    )
                     continue
-                if not e.startswith("GNS3_"):
-                    formatted = self._format_env(variables, e)
+                if not env.startswith("GNS3_"):
+                    formatted = self._format_env(variables, env)
                     vm_name = self._name.replace(",", ",,")
                     project_path = self.project.path.replace(",", ",,")
                     formatted = formatted.replace("%vm-name%", '"' + vm_name.replace('"', '\\"') + '"')
diff --git a/gns3server/compute/docker/iol_docker_vm.py b/gns3server/compute/docker/iol_docker_vm.py
index ff0ab2b00..070195e6b 100644
--- a/gns3server/compute/docker/iol_docker_vm.py
+++ b/gns3server/compute/docker/iol_docker_vm.py
@@ -92,8 +92,8 @@ class IOLDockerVM(VendorDockerVM):
     # controller-allocated application id (MACs would flip to the fallback
     # hash, colliding with the allocation pool) and any pending
     # startup-config delivered by a PUT.
-    _application_id = None
-    _startup_config_content = None
+    _application_id: int | None = None
+    _startup_config_content: str | None = None
     _startup_config_dirty = False
 
     def _parse_vendor_environment(self):
@@ -119,7 +119,7 @@ class IOLDockerVM(VendorDockerVM):
                         pass
 
     @property
-    def application_id(self) -> int:
+    def application_id(self) -> int | None:
         """
         IOL application ID: drives interface MACs (aabb.cc{app}{iface}) and
         the NVRAM file name. Allocated by the controller from the IOL Docker
@@ -178,6 +178,8 @@ class IOLDockerVM(VendorDockerVM):
         initial configuration dialog.
         """
 
+        if self._startup_config_content is None:
+            return
         content = self._startup_config_content.replace("%h", self._name)
         nvram_file = self._iol_nvram_file()
         os.makedirs(os.path.dirname(nvram_file), exist_ok=True)
@@ -189,7 +191,11 @@ class IOLDockerVM(VendorDockerVM):
             raise DockerError(f"Could not write IOL startup-config to NVRAM of container '{self._name}': {e}")
         log.debug("IOL container '%s': startup-config written to %s", self._name, nvram_file)
 
-    @DockerVM.name.setter
+    @property
+    def name(self):
+        return self._name
+
+    @name.setter
     def name(self, new_name):
         """
         Override: keep the hostname line inside the NVRAM in sync with the
@@ -228,7 +234,11 @@ class IOLDockerVM(VendorDockerVM):
         result["startup_config_content"] = self._startup_config_content
         return result
 
-    @DockerVM.adapters.setter
+    @property
+    def adapters(self):
+        return len(self._ethernet_adapters)
+
+    @adapters.setter
     def adapters(self, adapters):
         """
         Override: one IOL adapter is a 4-port unit — the IOU model. The
diff --git a/gns3server/compute/project.py b/gns3server/compute/project.py
index 6f683d5bc..8e6ef7648 100644
--- a/gns3server/compute/project.py
+++ b/gns3server/compute/project.py
@@ -466,7 +466,7 @@ class Project:
             )
 
         # Non-recursive: list only the current directory level
-        files = []
+        files: list[dict] = []
         try:
             scandir_iter = os.scandir(target_path)
         except PermissionError:
diff --git a/gns3server/compute/vmware/vmware_vm.py b/gns3server/compute/vmware/vmware_vm.py
index d36074f0b..b56b420a2 100644
--- a/gns3server/compute/vmware/vmware_vm.py
+++ b/gns3server/compute/vmware/vmware_vm.py
@@ -952,7 +952,11 @@ class VMwareVM(BaseNode):
         await self._stop_remote_console()
         await self._start_console()
 
-    @BaseNode.console_type.setter
+    @property
+    def console_type(self):
+        return self._console_type
+
+    @console_type.setter
     def console_type(self, new_console_type):
         """
         Sets the console type for this VMware VM.
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/controller/compute.py b/gns3server/controller/compute.py
index 6c22d16b2..f42f2e3a0 100644
--- a/gns3server/controller/compute.py
+++ b/gns3server/controller/compute.py
@@ -216,6 +216,13 @@ class Compute:
         """
         return self._host
 
+    @host.setter
+    def host(self, host):
+        self._host = host
+        self._host_ip_cache = None  # invalidate; re-resolve on next access
+        if self._console_host is None:
+            self._console_host = host
+
     @property
     def host_ip(self):
         """
@@ -228,13 +235,6 @@ class Compute:
                 self._host_ip_cache = "0.0.0.0"
         return self._host_ip_cache
 
-    @host.setter
-    def host(self, host):
-        self._host = host
-        self._host_ip_cache = None  # invalidate; re-resolve on next access
-        if self._console_host is None:
-            self._console_host = host
-
     @property
     def console_host(self):
         return self._console_host
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 c00d93afd..a95f406c0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -359,22 +359,17 @@ 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
   "gns3server.compute.dynamips.nodes.router",  # 2
   "gns3server.compute.iou.iou_vm",  # 4
   "gns3server.compute.iou.utils.iou_export",  # 2
   "gns3server.compute.iou.utils.iou_import",  # 2
   "gns3server.compute.project",  # 1
+  "gns3server.compute.qemu.qemu_vm",  # 2
   "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
   "gns3server.controller.project",  # 2
   "gns3server.controller.topology",  # 1
   "gns3server.db.models.acl",  # 1
@@ -420,7 +415,6 @@ 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