diff --git a/app/core/background/convert_v3_service.py b/app/core/background/convert_v3_service.py
index f950ba7..42f28a1 100644
--- a/app/core/background/convert_v3_service.py
+++ b/app/core/background/convert_v3_service.py
@@ -376,7 +376,12 @@ async def _pick_pending(limit: int) -> List[Tuple[EncryptedContent, PlainStaging
             if not staging:
                 peers = (await session.execute(select(KnownNode))).scalars().all()
                 for peer in peers:
-                    base_url = f"http://{peer.ip}:{peer.port}"
+                    meta = peer.meta or {}
+                    public_host = meta.get('public_host')
+                    if not public_host:
+                        last_resp = (meta.get('last_response') or {}).get('node', {}) if isinstance(meta, dict) else {}
+                        public_host = last_resp.get('public_host')
+                    base_url = public_host or f"http://{peer.ip}:{peer.port}"
                     dek = await request_key_from_peer(base_url, ec.encrypted_cid)
                     if not dek:
                         continue
diff --git a/app/core/network/key_client.py b/app/core/network/key_client.py
index 04fc781..2e03d04 100644
--- a/app/core/network/key_client.py
+++ b/app/core/network/key_client.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import base64
+import json
 from typing import Optional
 
 import httpx