diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0ac6f0af..6a54bcd8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,11 @@
 - 新增番剧放送日手动设置 API (`PATCH /api/v1/bangumi/{id}/weekday`)，支持锁定放送日防止日历刷新覆盖
 - 数据库迁移 v9：`bangumi` 表新增 `weekday_locked` 列
 
+### Fixed
+
+- 修复 qBittorrent 下载器 SSL 连接问题：解耦 HTTPS 协议选择与证书验证，自签名证书不再导致连接失败 (#923)
+- 修复 `torrents_rename_file` 重命名验证循环中 `continue` 应为 `break` 的逻辑错误
+
 ### Changed
 
 - 重构认证模块：提取 `_issue_token` 公共方法，消除 3 处重复的 JWT 签发逻辑
diff --git a/backend/src/module/downloader/client/qb_downloader.py b/backend/src/module/downloader/client/qb_downloader.py
index 66f931ff..7f888f6f 100644
--- a/backend/src/module/downloader/client/qb_downloader.py
+++ b/backend/src/module/downloader/client/qb_downloader.py
@@ -1,4 +1,5 @@
 import asyncio
+import json
 import logging
 
 import httpx
@@ -25,8 +26,11 @@ class QbDownloader:
 
     async def auth(self, retry=3):
         times = 0
-        timeout = httpx.Timeout(connect=3.1, read=10.0, write=10.0, pool=10.0)
-        self._client = httpx.AsyncClient(timeout=timeout, verify=self.ssl)
+        use_https = self.host.startswith("https://")
+        timeout = httpx.Timeout(connect=5.0, read=10.0, write=10.0, pool=10.0)
+        # Never verify certificates - self-signed certs are the norm for
+        # home-server / NAS / Docker qBittorrent setups.
+        self._client = httpx.AsyncClient(timeout=timeout, verify=False)
         while times < retry:
             try:
                 resp = await self._client.post(
@@ -45,13 +49,26 @@ class QbDownloader:
                     )
                     await asyncio.sleep(5)
                     times += 1
-            except httpx.ConnectError:
-                logger.error("Cannot connect to qBittorrent Server")
+            except httpx.ConnectError as e:
+                if use_https:
+                    logger.error(
+                        "Cannot connect to qBittorrent Server via HTTPS. "
+                        "If your qBittorrent uses plain HTTP, disable SSL in download settings."
+                    )
+                else:
+                    logger.error("Cannot connect to qBittorrent Server")
                 logger.info("Please check the IP and port in WebUI settings")
+                logger.debug("Connection error detail: %s", e)
                 await asyncio.sleep(10)
                 times += 1
             except Exception as e:
-                logger.error(f"Unknown error: {e}")
+                if use_https and "ssl" in str(e).lower():
+                    logger.error(
+                        "TLS/SSL error connecting to qBittorrent. "
+                        "If your qBittorrent uses plain HTTP, disable SSL in download settings."
+                    )
+                else:
+                    logger.error(f"Unknown error: {e}")
                 break
         return False
 
@@ -82,7 +99,7 @@ class QbDownloader:
     async def prefs_init(self, prefs):
         resp = await self._client.post(
             self._url("app/setPreferences"),
-            data={"json": __import__("json").dumps(prefs)},
+            data={"json": json.dumps(prefs)},
         )
         return resp
 
@@ -171,7 +188,6 @@ class QbDownloader:
                     raise
 
     async def get_torrents_by_tag(self, tag: str) -> list[dict]:
-        """Get all torrents with a specific tag."""
         resp = await self._client.get(self._url("torrents/info"), params={"tag": tag})
         return resp.json()
 
@@ -221,9 +237,9 @@ class QbDownloader:
                     if f.get("name") == new_path:
                         return True
                     if f.get("name") == old_path:
-                        # File still has old name - try again
+                        # File still has old name - break inner loop and retry
                         if attempt < 2:
-                            continue
+                            break
                         # Final attempt failed
                         logger.debug(
                             "[Downloader] Rename API returned 200 but file unchanged: %s", old_path
@@ -257,8 +273,6 @@ class QbDownloader:
         return resp.json()
 
     async def rss_set_rule(self, rule_name, rule_def):
-        import json
-
         await self._client.post(
             self._url("rss/setRule"),
             data={"ruleName": rule_name, "ruleDef": json.dumps(rule_def)},
diff --git a/backend/src/test/test_issue_bugs.py b/backend/src/test/test_issue_bugs.py
index a0af3420..f1ed1533 100644
--- a/backend/src/test/test_issue_bugs.py
+++ b/backend/src/test/test_issue_bugs.py
@@ -306,24 +306,23 @@ class TestIssue990NumberPrefixTitle:
 
     PROBLEM_TITLE = "[ANi] 29 岁单身中坚冒险家的日常 - 07 [1080P][Baha][WEB-DL][AAC AVC][CHT][MP4]"
 
-    def test_raw_parser_misparses_leading_number_as_episode(self):
-        """raw_parser matches leading '29 ' as episode number, losing the title."""
+    def test_raw_parser_correctly_parses_leading_number_title(self):
+        """raw_parser correctly parses title starting with number and extracts episode."""
         result = raw_parser(self.PROBLEM_TITLE)
-        # The regex matches "29 " as the episode pattern, so episode=29
-        # and all title fields are None
         assert result is not None
-        assert result.episode == 29
-        assert result.title_en is None
-        assert result.title_zh is None
-        assert result.title_jp is None
+        assert result.episode == 7
+        assert result.title_zh == "29 岁单身中坚冒险家的日常"
+        assert result.resolution == "1080P"
+        assert result.group == "ANi"
 
-    def test_title_parser_returns_none_when_title_raw_empty(self):
-        """TitleParser.raw_parser returns None when no title can be extracted."""
+    def test_title_parser_returns_bangumi_for_number_prefix_title(self):
+        """TitleParser.raw_parser returns a valid Bangumi for number-prefixed titles."""
         from module.parser.title_parser import TitleParser
 
         result = TitleParser.raw_parser(self.PROBLEM_TITLE)
-        # Should return None instead of a Bangumi with title_raw=None
-        assert result is None
+        assert result is not None
+        assert result.official_title == "29 岁单身中坚冒险家的日常"
+        assert result.title_raw == "29 岁单身中坚冒险家的日常"
 
     def test_add_title_alias_rejects_none(self, db_session):
         """add_title_alias should reject None as alias."""
diff --git a/backend/src/test/test_qb_downloader.py b/backend/src/test/test_qb_downloader.py
new file mode 100644
index 00000000..1630b4f6
--- /dev/null
+++ b/backend/src/test/test_qb_downloader.py
@@ -0,0 +1,449 @@
+"""Tests for QbDownloader: constructor, SSL/scheme logic, auth, and error handling.
+
+The implementation keeps _use_https as a local variable computed inside auth()
+from self.host, so SSL/HTTPS behaviour is validated by observing auth() side-effects
+(log messages) rather than reading an instance attribute directly.
+"""
+
+import logging
+import pytest
+from unittest.mock import AsyncMock, MagicMock, patch
+
+import httpx
+
+from module.downloader.client.qb_downloader import QbDownloader
+
+
+# ---------------------------------------------------------------------------
+# Constructor / URL building
+# ---------------------------------------------------------------------------
+
+
+class TestQbDownloaderConstructor:
+    """Verify host URL normalisation at construction time."""
+
+    def test_ssl_true_no_scheme_uses_https(self):
+        """ssl=True with bare host prepends https://."""
+        qb = QbDownloader(host="192.168.1.10:8080", username="admin", password="pass", ssl=True)
+        assert qb.host == "https://192.168.1.10:8080"
+
+    def test_ssl_false_no_scheme_uses_http(self):
+        """ssl=False with bare host prepends http://."""
+        qb = QbDownloader(host="192.168.1.10:8080", username="admin", password="pass", ssl=False)
+        assert qb.host == "http://192.168.1.10:8080"
+
+    def test_explicit_http_scheme_preserved_when_ssl_true(self):
+        """Explicit http:// scheme is kept even if ssl=True."""
+        qb = QbDownloader(
+            host="http://192.168.1.10:8080", username="admin", password="pass", ssl=True
+        )
+        assert qb.host == "http://192.168.1.10:8080"
+
+    def test_explicit_https_scheme_preserved_when_ssl_false(self):
+        """Explicit https:// scheme is kept even if ssl=False."""
+        qb = QbDownloader(
+            host="https://192.168.1.10:8080", username="admin", password="pass", ssl=False
+        )
+        assert qb.host == "https://192.168.1.10:8080"
+
+    def test_explicit_http_scheme_preserved_ssl_false(self):
+        """Explicit http:// URL with ssl=False stays as http://."""
+        qb = QbDownloader(host="http://nas.local:8080", username="u", password="p", ssl=False)
+        assert qb.host == "http://nas.local:8080"
+
+    def test_explicit_https_scheme_preserved_ssl_true(self):
+        """Explicit https:// URL with ssl=True stays as https://."""
+        qb = QbDownloader(host="https://nas.local:8080", username="u", password="p", ssl=True)
+        assert qb.host == "https://nas.local:8080"
+
+    def test_credentials_stored(self):
+        """Constructor stores username, password, and ssl flag as-is."""
+        qb = QbDownloader(
+            host="localhost:8080", username="admin", password="secret", ssl=False
+        )
+        assert qb.username == "admin"
+        assert qb.password == "secret"
+        assert qb.ssl is False
+
+    def test_client_initially_none(self):
+        """_client starts as None before any auth call."""
+        qb = QbDownloader(host="localhost:8080", username="admin", password="pass", ssl=False)
+        assert qb._client is None
+
+
+# ---------------------------------------------------------------------------
+# Scheme selection: parametrised matrix
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.parametrize(
+    "host,ssl,expected_prefix",
+    [
+        # Bare host - scheme derived from ssl flag
+        ("192.168.1.1:8080", True, "https://"),
+        ("192.168.1.1:8080", False, "http://"),
+        ("qb.home", True, "https://"),
+        ("qb.home", False, "http://"),
+        # Explicit http:// always wins regardless of ssl
+        ("http://192.168.1.1:8080", True, "http://"),
+        ("http://192.168.1.1:8080", False, "http://"),
+        # Explicit https:// always wins regardless of ssl
+        ("https://192.168.1.1:8080", True, "https://"),
+        ("https://192.168.1.1:8080", False, "https://"),
+    ],
+)
+def test_scheme_selection_matrix(host: str, ssl: bool, expected_prefix: str):
+    """Constructor resolves host scheme correctly for all input combinations."""
+    qb = QbDownloader(host=host, username="u", password="p", ssl=ssl)
+    assert qb.host.startswith(expected_prefix), (
+        f"host={host!r} ssl={ssl} -> expected prefix {expected_prefix!r}, got {qb.host!r}"
+    )
+
+
+# ---------------------------------------------------------------------------
+# auth: AsyncClient is created with verify=False
+# ---------------------------------------------------------------------------
+
+
+class TestAuthClientCreation:
+    """auth() must create the httpx.AsyncClient with verify=False unconditionally."""
+
+    async def test_auth_creates_client_with_verify_false_when_ssl_true(self):
+        """verify=False is used even when ssl=True (self-signed certs are common)."""
+        qb = QbDownloader(host="192.168.1.10:8080", username="admin", password="pass", ssl=True)
+
+        captured: list[dict] = []
+
+        class _FakeClient:
+            def __init__(self, **kwargs):
+                captured.append(kwargs)
+
+            async def post(self, url, data=None):
+                resp = MagicMock()
+                resp.status_code = 200
+                resp.text = "Ok."
+                return resp
+
+            async def aclose(self):
+                pass
+
+        with patch("module.downloader.client.qb_downloader.httpx.AsyncClient", _FakeClient):
+            result = await qb.auth()
+
+        assert result is True
+        assert len(captured) == 1
+        assert captured[0].get("verify") is False
+
+    async def test_auth_creates_client_with_verify_false_when_ssl_false(self):
+        """verify=False is used even when ssl=False."""
+        qb = QbDownloader(host="192.168.1.10:8080", username="admin", password="pass", ssl=False)
+
+        captured: list[dict] = []
+
+        class _FakeClient:
+            def __init__(self, **kwargs):
+                captured.append(kwargs)
+
+            async def post(self, url, data=None):
+                resp = MagicMock()
+                resp.status_code = 200
+                resp.text = "Ok."
+                return resp
+
+            async def aclose(self):
+                pass
+
+        with patch("module.downloader.client.qb_downloader.httpx.AsyncClient", _FakeClient):
+            result = await qb.auth()
+
+        assert result is True
+        assert captured[0].get("verify") is False
+
+    async def test_auth_uses_5_second_connect_timeout(self):
+        """auth() sets connect timeout to 5.0 seconds."""
+        qb = QbDownloader(host="localhost:8080", username="u", password="p", ssl=False)
+
+        captured_timeouts: list[httpx.Timeout] = []
+
+        class _FakeClient:
+            def __init__(self, **kwargs):
+                captured_timeouts.append(kwargs.get("timeout"))
+
+            async def post(self, url, data=None):
+                resp = MagicMock()
+                resp.status_code = 200
+                resp.text = "Ok."
+                return resp
+
+            async def aclose(self):
+                pass
+
+        with patch("module.downloader.client.qb_downloader.httpx.AsyncClient", _FakeClient):
+            await qb.auth()
+
+        assert len(captured_timeouts) == 1
+        assert captured_timeouts[0].connect == pytest.approx(5.0)
+
+
+# ---------------------------------------------------------------------------
+# auth: success / failure paths
+# ---------------------------------------------------------------------------
+
+
+class TestAuthSuccessFailure:
+    """auth() return value reflects qBittorrent server responses."""
+
+    async def test_auth_returns_true_on_ok_response(self):
+        """Returns True when server responds 200 + 'Ok.'."""
+        qb = QbDownloader(host="localhost:8080", username="admin", password="pass", ssl=False)
+
+        mock_client = AsyncMock()
+        mock_resp = MagicMock()
+        mock_resp.status_code = 200
+        mock_resp.text = "Ok."
+        mock_client.post = AsyncMock(return_value=mock_resp)
+
+        with patch(
+            "module.downloader.client.qb_downloader.httpx.AsyncClient",
+            return_value=mock_client,
+        ):
+            result = await qb.auth()
+
+        assert result is True
+
+    async def test_auth_returns_false_on_403(self):
+        """Returns False and stops retrying immediately on 403 Forbidden."""
+        qb = QbDownloader(host="localhost:8080", username="admin", password="pass", ssl=False)
+
+        mock_client = AsyncMock()
+        mock_resp = MagicMock()
+        mock_resp.status_code = 403
+        mock_resp.text = "Forbidden"
+        mock_client.post = AsyncMock(return_value=mock_resp)
+
+        with patch(
+            "module.downloader.client.qb_downloader.httpx.AsyncClient",
+            return_value=mock_client,
+        ):
+            result = await qb.auth(retry=3)
+
+        assert result is False
+        # Should break immediately on 403, not exhaust all retries
+        assert mock_client.post.call_count == 1
+
+    async def test_auth_retries_up_to_limit_on_server_error(self):
+        """Retries up to the retry limit on non-200/non-403 responses."""
+        qb = QbDownloader(host="localhost:8080", username="admin", password="pass", ssl=False)
+
+        mock_client = AsyncMock()
+        mock_resp = MagicMock()
+        mock_resp.status_code = 500
+        mock_resp.text = "Internal Server Error"
+        mock_client.post = AsyncMock(return_value=mock_resp)
+
+        with patch(
+            "module.downloader.client.qb_downloader.httpx.AsyncClient",
+            return_value=mock_client,
+        ):
+            with patch(
+                "module.downloader.client.qb_downloader.asyncio.sleep",
+                new_callable=AsyncMock,
+            ):
+                result = await qb.auth(retry=2)
+
+        assert result is False
+        assert mock_client.post.call_count == 2
+
+
+# ---------------------------------------------------------------------------
+# auth: ConnectError logging - HTTPS vs HTTP message branching
+# ---------------------------------------------------------------------------
+
+
+class TestAuthConnectErrorLogging:
+    """On ConnectError, the log message depends on whether the URL uses https://."""
+
+    async def test_https_url_logs_https_specific_guidance(self, caplog):
+        """HTTPS-specific guidance is logged when host uses https:// and ConnectError occurs."""
+        # Use explicit https:// URL so the local use_https flag is True
+        qb = QbDownloader(
+            host="https://192.168.1.10:8080", username="u", password="p", ssl=True
+        )
+
+        mock_client = AsyncMock()
+        mock_client.post = AsyncMock(side_effect=httpx.ConnectError("Connection refused"))
+
+        with patch(
+            "module.downloader.client.qb_downloader.httpx.AsyncClient",
+            return_value=mock_client,
+        ):
+            with patch(
+                "module.downloader.client.qb_downloader.asyncio.sleep",
+                new_callable=AsyncMock,
+            ):
+                with caplog.at_level(
+                    logging.ERROR, logger="module.downloader.client.qb_downloader"
+                ):
+                    result = await qb.auth(retry=1)
+
+        assert result is False
+        error_messages = [r.message for r in caplog.records if r.levelno == logging.ERROR]
+        assert any("HTTPS" in msg for msg in error_messages)
+        assert any(
+            "disable SSL" in msg or "plain HTTP" in msg for msg in error_messages
+        )
+
+    async def test_https_url_derived_from_ssl_flag_logs_https_guidance(self, caplog):
+        """HTTPS guidance also fires when scheme comes from ssl=True (bare host)."""
+        # Bare host + ssl=True -> self.host becomes https://... -> use_https=True in auth()
+        qb = QbDownloader(host="192.168.1.10:8080", username="u", password="p", ssl=True)
+        assert qb.host.startswith("https://")
+
+        mock_client = AsyncMock()
+        mock_client.post = AsyncMock(side_effect=httpx.ConnectError("refused"))
+
+        with patch(
+            "module.downloader.client.qb_downloader.httpx.AsyncClient",
+            return_value=mock_client,
+        ):
+            with patch(
+                "module.downloader.client.qb_downloader.asyncio.sleep",
+                new_callable=AsyncMock,
+            ):
+                with caplog.at_level(
+                    logging.ERROR, logger="module.downloader.client.qb_downloader"
+                ):
+                    await qb.auth(retry=1)
+
+        error_messages = [r.message for r in caplog.records if r.levelno == logging.ERROR]
+        assert any("HTTPS" in msg for msg in error_messages)
+
+    async def test_http_url_logs_generic_message_without_ssl_hint(self, caplog):
+        """Generic connection error is logged when host uses http:// and ConnectError occurs."""
+        qb = QbDownloader(
+            host="http://192.168.1.10:8080", username="u", password="p", ssl=False
+        )
+
+        mock_client = AsyncMock()
+        mock_client.post = AsyncMock(side_effect=httpx.ConnectError("Connection refused"))
+
+        with patch(
+            "module.downloader.client.qb_downloader.httpx.AsyncClient",
+            return_value=mock_client,
+        ):
+            with patch(
+                "module.downloader.client.qb_downloader.asyncio.sleep",
+                new_callable=AsyncMock,
+            ):
+                with caplog.at_level(
+                    logging.ERROR, logger="module.downloader.client.qb_downloader"
+                ):
+                    result = await qb.auth(retry=1)
+
+        assert result is False
+        error_messages = [r.message for r in caplog.records if r.levelno == logging.ERROR]
+        assert any("Cannot connect to qBittorrent Server" in msg for msg in error_messages)
+        # SSL-disable hint must NOT appear for plain HTTP connections
+        assert not any("disable SSL" in msg for msg in error_messages)
+
+    async def test_http_url_derived_from_ssl_flag_false_no_ssl_hint(self, caplog):
+        """SSL-disable hint is absent when scheme comes from ssl=False (bare host)."""
+        qb = QbDownloader(host="192.168.1.10:8080", username="u", password="p", ssl=False)
+        assert qb.host.startswith("http://")
+
+        mock_client = AsyncMock()
+        mock_client.post = AsyncMock(side_effect=httpx.ConnectError("refused"))
+
+        with patch(
+            "module.downloader.client.qb_downloader.httpx.AsyncClient",
+            return_value=mock_client,
+        ):
+            with patch(
+                "module.downloader.client.qb_downloader.asyncio.sleep",
+                new_callable=AsyncMock,
+            ):
+                with caplog.at_level(
+                    logging.ERROR, logger="module.downloader.client.qb_downloader"
+                ):
+                    await qb.auth(retry=1)
+
+        all_messages = " ".join(r.message for r in caplog.records)
+        assert "disable SSL" not in all_messages
+        assert "plain HTTP" not in all_messages
+
+    async def test_connect_error_logs_check_ip_port_info(self, caplog):
+        """Both HTTPS and HTTP paths log an info message about checking IP/port."""
+        qb = QbDownloader(
+            host="https://192.168.1.10:8080", username="u", password="p", ssl=True
+        )
+
+        mock_client = AsyncMock()
+        mock_client.post = AsyncMock(side_effect=httpx.ConnectError("refused"))
+
+        with patch(
+            "module.downloader.client.qb_downloader.httpx.AsyncClient",
+            return_value=mock_client,
+        ):
+            with patch(
+                "module.downloader.client.qb_downloader.asyncio.sleep",
+                new_callable=AsyncMock,
+            ):
+                with caplog.at_level(
+                    logging.INFO, logger="module.downloader.client.qb_downloader"
+                ):
+                    await qb.auth(retry=1)
+
+        info_messages = [r.message for r in caplog.records if r.levelno == logging.INFO]
+        assert any("IP" in msg or "port" in msg for msg in info_messages)
+
+    async def test_explicit_http_with_ssl_true_still_uses_generic_message(self, caplog):
+        """Explicit http:// URL overrides ssl=True: generic error message, no HTTPS hint."""
+        # ssl=True but explicit http:// -> use_https=False inside auth()
+        qb = QbDownloader(
+            host="http://192.168.1.10:8080", username="u", password="p", ssl=True
+        )
+        assert qb.host.startswith("http://")
+
+        mock_client = AsyncMock()
+        mock_client.post = AsyncMock(side_effect=httpx.ConnectError("refused"))
+
+        with patch(
+            "module.downloader.client.qb_downloader.httpx.AsyncClient",
+            return_value=mock_client,
+        ):
+            with patch(
+                "module.downloader.client.qb_downloader.asyncio.sleep",
+                new_callable=AsyncMock,
+            ):
+                with caplog.at_level(
+                    logging.ERROR, logger="module.downloader.client.qb_downloader"
+                ):
+                    await qb.auth(retry=1)
+
+        error_messages = [r.message for r in caplog.records if r.levelno == logging.ERROR]
+        assert not any("disable SSL" in msg for msg in error_messages)
+        assert not any("HTTPS" in msg for msg in error_messages)
+
+
+# ---------------------------------------------------------------------------
+# _url helper
+# ---------------------------------------------------------------------------
+
+
+class TestUrlHelper:
+    """_url() builds the correct API endpoint path."""
+
+    def test_url_format_with_http(self):
+        """_url returns host + /api/v2/ + endpoint for http hosts."""
+        qb = QbDownloader(host="localhost:8080", username="u", password="p", ssl=False)
+        assert qb._url("auth/login") == "http://localhost:8080/api/v2/auth/login"
+
+    def test_url_format_with_https(self):
+        """_url includes https:// when SSL is used."""
+        qb = QbDownloader(host="nas.local:8080", username="u", password="p", ssl=True)
+        assert qb._url("app/version") == "https://nas.local:8080/api/v2/app/version"
+
+    def test_url_with_explicit_http_scheme_overriding_ssl_true(self):
+        """_url works correctly when explicit http:// scheme overrides ssl=True."""
+        qb = QbDownloader(host="http://nas.local:8080", username="u", password="p", ssl=True)
+        assert qb._url("torrents/info") == "http://nas.local:8080/api/v2/torrents/info"
diff --git a/backend/uv.lock b/backend/uv.lock
index ddea71e3..00473cb5 100644
--- a/backend/uv.lock
+++ b/backend/uv.lock
@@ -61,7 +61,7 @@ wheels = [
 
 [[package]]
 name = "auto-bangumi"
-version = "3.2.3"
+version = "3.2.4"
 source = { virtual = "." }
 dependencies = [
     { name = "aiosqlite" },