diff --git a/homeassistant/components/denon_rs232/__init__.py b/homeassistant/components/denon_rs232/__init__.py
index 820daf3d9d9..aab9f683420 100644
--- a/homeassistant/components/denon_rs232/__init__.py
+++ b/homeassistant/components/denon_rs232/__init__.py
@@ -29,6 +29,8 @@ async def async_setup_entry(hass: HomeAssistant, entry: DenonRS232ConfigEntry) -
         await receiver.query_state()
     except (ConnectionError, OSError) as err:
         LOGGER.error("Error connecting to Denon receiver at %s: %s", port, err)
+        if receiver.connected:
+            await receiver.disconnect()
         raise ConfigEntryNotReady from err
 
     entry.runtime_data = receiver
diff --git a/homeassistant/components/denon_rs232/config_flow.py b/homeassistant/components/denon_rs232/config_flow.py
index 2365ca14ee8..935f3705703 100644
--- a/homeassistant/components/denon_rs232/config_flow.py
+++ b/homeassistant/components/denon_rs232/config_flow.py
@@ -2,7 +2,6 @@
 
 from __future__ import annotations
 
-import os
 from typing import Any
 
 from denon_rs232 import DenonReceiver
@@ -131,7 +130,7 @@ def get_ports() -> dict[str, str]:
     """Get available serial ports keyed by their device path."""
     return {
         port.device: human_readable_device_name(
-            os.path.realpath(port.device),
+            port.device,
             port.serial_number,
             port.manufacturer,
             port.description,