Use root user for serial loopback, Admin for network connections

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

es24n_conf.py

@@ -396,7 +396,8 @@ def _redfish_request(password: str, method: str, path: str,
     Returns (success: bool, data: dict|str).
     """
     url         = f"https://{host}{path}"
-    credentials = b64encode(f"Admin:{password}".encode()).decode()
+    username    = "root" if host == "127.0.0.1" else "Admin"
+    credentials = b64encode(f"{username}:{password}".encode()).decode()
     ctx         = ssl.create_default_context()
     ctx.check_hostname = False
     ctx.verify_mode    = ssl.CERT_NONE
@@ -452,7 +453,7 @@ def _redfish_upload_firmware(password: str, host: str, fw_path: str) -> tuple:
     ).encode() + file_data + f"\r\n--{boundary}--\r\n".encode()
 
     url         = f"https://{host}/redfish/v1/UpdateService"
-    credentials = b64encode(f"Admin:{password}".encode()).decode()
+    credentials = b64encode(f"Admin:{password}".encode()).decode()  # always network
     ctx         = ssl.create_default_context()
     ctx.check_hostname = False
     ctx.verify_mode    = ssl.CERT_NONE