diff --git a/backend/llm/orchestrator.py b/backend/llm/orchestrator.py
index 30dba5a..1aeb4fd 100644
--- a/backend/llm/orchestrator.py
+++ b/backend/llm/orchestrator.py
@@ -2695,29 +2695,12 @@ def _runtime_progress_root() -> Path:
     return progress_root
 
 
-def _legacy_orchestration_progress_file_path(run_id: str) -> Path:
-    safe_run_id = re.sub(r"[^A-Za-z0-9._-]", "_", str(run_id or "unknown"))
-    return _runtime_progress_root() / f"{safe_run_id}.json"
-
-
 def _orchestration_progress_file_path(run_id: str) -> Path:
-    normalized_run_id = str(run_id or "unknown")
-    safe_run_id = re.sub(r"[^A-Za-z0-9_.-]", "_", normalized_run_id).strip("._-")
-    if not safe_run_id:
-        safe_run_id = "unknown"
+    normalized_run_id = str(run_id if run_id is not None else "unknown")
+    if normalized_run_id == "":
+        normalized_run_id = "unknown"
     runtime_root = _runtime_progress_root().resolve()
-    legacy_path = _legacy_orchestration_progress_file_path(safe_run_id)
-    try:
-        resolved_legacy_path = legacy_path.resolve()
-        if resolved_legacy_path.exists() and resolved_legacy_path.is_relative_to(runtime_root):
-            return resolved_legacy_path
-    except Exception:
-        logger.warning(
-            "Ignoring unsafe legacy orchestration progress path for run_id=%s",
-            safe_run_id,
-            exc_info=True,
-        )
-    file_name = f"{hashlib.sha256(safe_run_id.encode('utf-8')).hexdigest()}.json"
+    file_name = f"{hashlib.sha256(normalized_run_id.encode('utf-8')).hexdigest()}.json"
     return runtime_root / file_name
 
 
diff --git a/run_profiler_backend.py b/run_profiler_backend.py
index 19a6b96..55c66ab 100644
--- a/run_profiler_backend.py
+++ b/run_profiler_backend.py
@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import ipaddress
 import logging
 import os
 import socket
@@ -32,8 +33,35 @@ def _is_container_runtime() -> bool:
 
 
 def _default_profiler_host() -> str:
-    if _is_container_runtime():
-        return "0.0.0.0"
+    return "127.0.0.1"
+
+
+def _resolve_profiler_host() -> str:
+    requested_host = (os.getenv("BACKEND_PROFILER_HOST") or _default_profiler_host()).strip()
+    allow_remote = (os.getenv("BACKEND_PROFILER_ALLOW_REMOTE", "") or "").strip().lower() in {"1", "true", "yes", "on"}
+    if requested_host == "localhost":
+        try:
+            infos = socket.getaddrinfo("localhost", None)
+            if infos and all(ipaddress.ip_address(info[4][0]).is_loopback for info in infos):
+                return requested_host
+        except Exception:
+            logger.warning("[WARN] failed to resolve localhost loopback addresses", exc_info=True)
+        logger.warning("[WARN] localhost does not resolve to loopback only; fallback to 127.0.0.1")
+        return "127.0.0.1"
+    if requested_host in {"127.0.0.1", "::1"}:
+        return requested_host
+    try:
+        requested_ip = ipaddress.ip_address(requested_host)
+    except (TypeError, ValueError):
+        logger.warning("[WARN] hostname profiler host=%s is not allowed; fallback to 127.0.0.1", requested_host)
+        return "127.0.0.1"
+    if requested_ip.is_loopback:
+        return requested_host
+    if allow_remote:
+        if requested_ip.is_unspecified:
+            logger.warning("[WARN] profiler backend is binding to all interfaces (host=%s)", requested_host)
+        return requested_host
+    logger.warning("[WARN] remote profiler host=%s blocked; set BACKEND_PROFILER_ALLOW_REMOTE=true to allow", requested_host)
     return "127.0.0.1"
 
 
@@ -68,7 +96,7 @@ def _resolve_bind_port(host: str, requested_port: int, max_attempts: int = 20) -
 def main() -> None:
     import uvicorn
 
-    host = os.getenv("BACKEND_PROFILER_HOST", _default_profiler_host())
+    host = _resolve_profiler_host()
     port = _resolve_bind_port(host, int(os.getenv("BACKEND_PROFILER_PORT", "8000")))
     logger.info("[OK] profiler backend bind target: http://%s:%s", host, port)
     uvicorn.run(app, host=host, port=port, reload=False)