diff --git a/app/src/main/java/com/m57/hermescontrol/data/remote/CookieSerialization.kt b/app/src/main/java/com/m57/hermescontrol/data/remote/CookieSerialization.kt
index 9a9bb018..e86ea814 100644
--- a/app/src/main/java/com/m57/hermescontrol/data/remote/CookieSerialization.kt
+++ b/app/src/main/java/com/m57/hermescontrol/data/remote/CookieSerialization.kt
@@ -86,8 +86,25 @@ fun sessionCookieFromValue(value: String): Cookie? = wrapSessionCookie(value)
 
 const val SESSION_COOKIE_NAME = "hermes_session_at"
 
+/**
+ * All names the dashboard may use for its session cookie, strictest variant
+ * first. Over HTTPS the server emits a [`__Host-`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Cookies#cookie_prefixes)
+ * (root-facing HTTPS) or `__Secure-` (HTTPS reverse-proxy with a path prefix)
+ * prefixed cookie; the bare name is the legacy HTTP form. Ordering matches the
+ * server's own fallback precedence so the most-constrained variant wins.
+ */
+val SESSION_COOKIE_NAMES: List<String> =
+    listOf(
+        "__Host-$SESSION_COOKIE_NAME",
+        "__Secure-$SESSION_COOKIE_NAME",
+        SESSION_COOKIE_NAME,
+    )
+
+/** True when [name] is any recognized dashboard session-cookie name. */
+fun isSessionCookieName(name: String): Boolean = name in SESSION_COOKIE_NAMES
+
 /** True when [cookie] is the dashboard session cookie. */
-fun isSessionCookie(cookie: Cookie): Boolean = cookie.name == SESSION_COOKIE_NAME
+fun isSessionCookie(cookie: Cookie): Boolean = isSessionCookieName(cookie.name)
 
 /** Parse a raw `Set-Cookie` header value (sans the `hermes_session_at=` key). */
 fun Cookie.Companion.parseRaw(
diff --git a/app/src/main/java/com/m57/hermescontrol/data/remote/PersistentCookieJar.kt b/app/src/main/java/com/m57/hermescontrol/data/remote/PersistentCookieJar.kt
index be18059e..a67c4682 100644
--- a/app/src/main/java/com/m57/hermescontrol/data/remote/PersistentCookieJar.kt
+++ b/app/src/main/java/com/m57/hermescontrol/data/remote/PersistentCookieJar.kt
@@ -74,8 +74,14 @@ class PersistentCookieJar(
         return null
     }
 
-    /** Convenience: value of the `hermes_session_at` session cookie. */
-    fun getSessionCookieValue(): String? = getCookie(SESSION_COOKIE_NAME)?.value
+    /**
+     * Convenience: value of the dashboard session cookie.
+     *
+     * Iterates [SESSION_COOKIE_NAMES] (strictest `__Host-` / `__Secure-`
+     * prefix first) and returns the first match. Over HTTPS the server may
+     * store the cookie under a prefixed name the bare-name lookup would miss.
+     */
+    fun getSessionCookieValue(): String? = SESSION_COOKIE_NAMES.firstNotNullOfOrNull { name -> getCookie(name)?.value }
 
     override fun saveFromResponse(
         url: HttpUrl,
diff --git a/app/src/main/java/com/m57/hermescontrol/data/remote/ProfileScopeInterceptor.kt b/app/src/main/java/com/m57/hermescontrol/data/remote/ProfileScopeInterceptor.kt
index 75ec2592..3d0199bf 100644
--- a/app/src/main/java/com/m57/hermescontrol/data/remote/ProfileScopeInterceptor.kt
+++ b/app/src/main/java/com/m57/hermescontrol/data/remote/ProfileScopeInterceptor.kt
@@ -62,7 +62,15 @@ object ProfileScopeInterceptor : Interceptor {
             return chain.proceed(request) // explicit param wins
         }
 
-        if (!isProfileScopedPath(url.encodedPath)) {
+        // Derive the path relative to the endpoint's proxy prefix so profile
+        // scoping works when the dashboard is served behind a reverse proxy
+        // (e.g. `/hermes/api/status` → relative `/api/status`). A transient
+        // DataStore read failure mid-intercept must not crash every request.
+        val relativePath =
+            runCatching { AuthManager.endpoint().relativeRequestPath(url) }
+                .getOrDefault(url.encodedPath)
+
+        if (!isProfileScopedPath(relativePath)) {
             return chain.proceed(request)
         }
 
diff --git a/app/src/main/java/com/m57/hermescontrol/data/ws/HermesWsClient.kt b/app/src/main/java/com/m57/hermescontrol/data/ws/HermesWsClient.kt
index c6d28865..c2a4ff0e 100644
--- a/app/src/main/java/com/m57/hermescontrol/data/ws/HermesWsClient.kt
+++ b/app/src/main/java/com/m57/hermescontrol/data/ws/HermesWsClient.kt
@@ -253,13 +253,6 @@ object HermesWsClient {
             return true
         }
 
-        val sessionCookie = AuthManager.getSessionCookie()
-        if (sessionCookie.isNullOrBlank()) {
-            Log.w(TAG, "WS ticket refresh aborted: no session cookie found in gated mode")
-            _connectionStatus.value = ConnectionStatus.AUTH_EXPIRED
-            return false
-        }
-
         try {
             val client = OkHttpProvider.probe
             val request =
@@ -294,7 +287,7 @@ object HermesWsClient {
                 return false
             }
         } catch (e: Exception) {
-            Log.w(TAG, "WS ticket refresh failed: ${e.message}")
+            Log.w(TAG, "WS ticket refresh failed: ${e.javaClass.simpleName}")
             _connectionStatus.value = ConnectionStatus.AUTH_EXPIRED
             return false
         }
@@ -539,7 +532,8 @@ object HermesWsClient {
             code: Int,
             reason: String,
         ) {
-            Log.d(TAG, "WebSocket closing: $code $reason")
+            // Do NOT log [reason] — it may carry server-side context.
+            Log.d(TAG, "WebSocket closing: $code")
             webSocket.close(code, reason)
         }
 
@@ -548,7 +542,9 @@ object HermesWsClient {
             code: Int,
             reason: String,
         ) {
-            Log.i(TAG, "WebSocket closed: $code $reason")
+            // Do NOT log [reason] — it may carry server-side context. The
+            // reason is still inspected internally to detect auth failures.
+            Log.i(TAG, "WebSocket closed: $code")
             connected.set(false)
             stopHealthTracking()
             if (code == 4001 || code == 4401 ||
@@ -567,7 +563,10 @@ object HermesWsClient {
             t: Throwable,
             response: Response?,
         ) {
-            Log.e(TAG, "WebSocket failure: ${t.message}", t)
+            // Log the exception class only — [Throwable.message] can leak URLs
+            // or headers. The message is still inspected internally for auth
+            // detection.
+            Log.e(TAG, "WebSocket failure: ${t.javaClass.simpleName}", t)
             connected.set(false)
             stopHealthTracking()
             val code = response?.code ?: 0
diff --git a/app/src/test/java/com/m57/hermescontrol/data/remote/CookieManagerTest.kt b/app/src/test/java/com/m57/hermescontrol/data/remote/CookieManagerTest.kt
index a3334c25..02487eee 100644
--- a/app/src/test/java/com/m57/hermescontrol/data/remote/CookieManagerTest.kt
+++ b/app/src/test/java/com/m57/hermescontrol/data/remote/CookieManagerTest.kt
@@ -1,10 +1,12 @@
 package com.m57.hermescontrol.data.remote
 
 import kotlinx.coroutines.test.runTest
+import okhttp3.Cookie
 import okhttp3.HttpUrl.Companion.toHttpUrl
 import org.junit.After
 import org.junit.Assert.assertEquals
 import org.junit.Assert.assertNull
+import org.junit.Assert.assertTrue
 import org.junit.Test
 
 /**
@@ -28,11 +30,62 @@ class CookieManagerTest {
         return ServerEndpoint.fromLegacy(host, 9119)
     }
 
+    private fun httpsEp(
+        host: String,
+        path: String = "/",
+    ): ServerEndpoint =
+        ServerEndpoint.parse(
+            "https://$host:9119$path",
+            CleartextPolicy.ALLOW_WITH_WARNING,
+        )
+
     @After
     fun tearDown() {
         CookieManager.resetForTest()
     }
 
+    @Test
+    fun getSessionCookie_recognizesHostPrefixedCookie() =
+        runTest {
+            val jar = buildFakePersistentCookieJar()
+            jar.useStore(PersistentCookieJar.DEFAULT_SERVER_ID)
+            CookieManager.setJarForTest(jar)
+            // Server stored a __Host- prefixed cookie (HTTPS deployment).
+            jar.saveFromResponse(
+                "https://dash.local/".toHttpUrl(),
+                listOf(
+                    Cookie
+                        .Builder()
+                        .name("__Host-hermes_session_at")
+                        .value("prefixed-value")
+                        .expiresAt(System.currentTimeMillis() + 10L * 365 * 24 * 60 * 60 * 1000)
+                        .hostOnlyDomain("dash.local")
+                        .path("/")
+                        .secure()
+                        .httpOnly()
+                        .build(),
+                ),
+            )
+
+            assertEquals("prefixed-value", CookieManager.getSessionCookie())
+        }
+
+    @Test
+    fun setSessionCookie_httpsMarksSecureAndHonorsPath() =
+        runTest {
+            val jar = fakeJar()
+            // Proxy-prefixed HTTPS endpoint.
+            CookieManager.setSessionCookie("sess-secure", httpsEp("dash.local", "/hermes/"))
+
+            val cookies =
+                jar.loadForRequest(
+                    "https://dash.local/hermes/api/status".toHttpUrl(),
+                )
+            assertEquals(1, cookies.size)
+            assertTrue("HTTPS session cookie must be Secure", cookies[0].secure)
+            assertEquals("/hermes/", cookies[0].path)
+        }
+
     @Test
     fun setThenGetSessionCookie_roundTrips() {
         fakeJar()
diff --git a/app/src/test/java/com/m57/hermescontrol/data/remote/PersistentCookieJarTest.kt b/app/src/test/java/com/m57/hermescontrol/data/remote/PersistentCookieJarTest.kt
index 585033ec..6344db27 100644
--- a/app/src/test/java/com/m57/hermescontrol/data/remote/PersistentCookieJarTest.kt
+++ b/app/src/test/java/com/m57/hermescontrol/data/remote/PersistentCookieJarTest.kt
@@ -179,4 +179,60 @@ class PersistentCookieJarTest {
         assertTrue(jar.loadForRequest("http://empty.local/".toHttpUrl()).isEmpty())
         assertNull(jar.getSessionCookieValue())
     }
+
+    @Test
+    fun getSessionCookieValue_findsPrefixedHostCookie() =
+        runTest {
+            val jar = makeJar()
+            jar.useStore("prefixed-scope")
+            val url = "https://dash.local/".toHttpUrl()
+            val prefixed =
+                Cookie
+                    .Builder()
+                    .name("__Host-hermes_session_at")
+                    .value("host-prefixed-value")
+                    .expiresAt(System.currentTimeMillis() + 10L * 365 * 24 * 60 * 60 * 1000)
+                    .hostOnlyDomain("dash.local")
+                    .path("/")
+                    .secure()
+                    .httpOnly()
+                    .build()
+            jar.saveFromResponse(url, listOf(prefixed))
+
+            assertEquals("host-prefixed-value", jar.getSessionCookieValue())
+        }
+
+    @Test
+    fun getSessionCookieValue_prefersStrictestVariant() =
+        runTest {
+            val jar = makeJar()
+            jar.useStore("multi-scope")
+            val url = "https://dash.local/".toHttpUrl()
+            // Both a bare and a __Secure- prefixed cookie present; the strictest
+            // (__Host- / __Secure- first in SESSION_COOKIE_NAMES) must win.
+            val bare =
+                Cookie
+                    .Builder()
+                    .name(SESSION_COOKIE_NAME)
+                    .value("bare-value")
+                    .expiresAt(System.currentTimeMillis() + 10L * 365 * 24 * 60 * 60 * 1000)
+                    .hostOnlyDomain("dash.local")
+                    .path("/")
+                    .httpOnly()
+                    .build()
+            val secure =
+                Cookie
+                    .Builder()
+                    .name("__Secure-hermes_session_at")
+                    .value("secure-value")
+                    .expiresAt(System.currentTimeMillis() + 10L * 365 * 24 * 60 * 60 * 1000)
+                    .hostOnlyDomain("dash.local")
+                    .path("/")
+                    .secure()
+                    .httpOnly()
+                    .build()
+            jar.saveFromResponse(url, listOf(bare, secure))
+
+            assertEquals("secure-value", jar.getSessionCookieValue())
+        }
 }
diff --git a/app/src/test/java/com/m57/hermescontrol/data/ws/HermesWsClientTest.kt b/app/src/test/java/com/m57/hermescontrol/data/ws/HermesWsClientTest.kt
index 7a73746e..508a30bd 100644
--- a/app/src/test/java/com/m57/hermescontrol/data/ws/HermesWsClientTest.kt
+++ b/app/src/test/java/com/m57/hermescontrol/data/ws/HermesWsClientTest.kt
@@ -2,9 +2,12 @@ package com.m57.hermescontrol.data.ws
 
 import android.util.Log
 import com.m57.hermescontrol.data.local.AuthManager
+import com.m57.hermescontrol.data.remote.CleartextPolicy
 import com.m57.hermescontrol.data.remote.CookieManager
+import com.m57.hermescontrol.data.remote.ServerEndpoint
 import com.m57.hermescontrol.data.remote.buildFakePersistentCookieJar
 import io.mockk.every
+import io.mockk.mockk
 import io.mockk.mockkObject
 import io.mockk.mockkStatic
 import io.mockk.unmockkAll
@@ -45,6 +48,13 @@ class HermesWsClientTest {
         every { AuthManager.wsUrl() } returns mockWebServer.url("/").toString().replace("http://", "ws://")
         every { AuthManager.isAutoReconnect() } returns false
         every { AuthManager.getSessionCookie() } returns null
+        // Non-gated by default (token mode) so the gated ticket path is exercised
+        // only by the explicit gated-mode test below.
+        every { AuthManager.serverStore } returns
+            mockk<com.m57.hermescontrol.data.config.ServerStore>().also {
+                every { it.getLatestState() } returns
+                    com.m57.hermescontrol.data.config.ServerStoreState()
+            }
 
         // Issue #470: clients are built through OkHttpProvider, which now
         // resolves the shared CookieManager.cookieJar. Inject a fake jar so
@@ -475,4 +485,65 @@ class HermesWsClientTest {
         assertEquals(ConnectionStatus.DISCONNECTED, HermesWsClient.connectionStatus.value)
         assertFalse(HermesWsClient.isConnected)
     }
+
+    // ── Issue #635: gated-mode WS ticket fetch must not be blocked by a
+    // missing bare-name session cookie (HTTPS deployments prefix it with
+    // __Host- / __Secure-). ────────────────────────────────────────────────
+
+    @Test
+    fun testGatedMode_attemptsTicketFetchWithoutBareCookie() {
+        // Force gated mode (ws auth via ticket, not loopback token).
+        every { AuthManager.serverStore } returns
+            mockk<com.m57.hermescontrol.data.config.ServerStore>().also {
+                every { it.getLatestState() } returns
+                    com.m57.hermescontrol.data.config.ServerStoreState(wsAuthParam = "ticket")
+            }
+        // No bare-name session cookie present (the prefixed one is server-side).
+        every { AuthManager.getSessionCookie() } returns null
+        // setToken is exercised by the ticket refresh; stub it (AuthManager is
+        // a mocked object, so unstubbed calls throw).
+        every { AuthManager.setToken(any()) } returns Unit
+
+        // Separate server for the ticket endpoint so its queue can't interleave
+        // with the WebSocket upgrade on the main mockWebServer.
+        val ticketServer = MockWebServer()
+        ticketServer.start()
+        every { AuthManager.endpointForBuild() } returns
+            ServerEndpoint.parse(
+                ticketServer.url("/").toString(),
+                CleartextPolicy.ALLOW_WITH_WARNING,
+            )
+        ticketServer.enqueue(
+            MockResponse()
+                .setResponseCode(200)
+                .setBody("""{"ticket":"refreshed-ticket"}"""),
+        )
+
+        val connectLatch = CountDownLatch(1)
+        mockWebServer.enqueue(
+            MockResponse().withWebSocketUpgrade(
+                object : WebSocketListener() {
+                    override fun onOpen(
+                        ws: WebSocket,
+                        response: okhttp3.Response,
+                    ) {
+                        connectLatch.countDown()
+                    }
+                },
+            ),
+        )
+
+        HermesWsClient.connect()
+
+        // Before the fix, a null bare cookie short-circuited to AUTH_EXPIRED and
+        // the ticket endpoint was NEVER called. After the fix it is attempted,
+        // so the connection reaches CONNECTED.
+        assertTrue(
+            "Gated WS ticket fetch should be attempted even without a bare cookie",
+            connectLatch.await(5, TimeUnit.SECONDS),
+        )
+        assertEquals(ConnectionStatus.CONNECTED, HermesWsClient.connectionStatus.value)
+
+        ticketServer.shutdown()
+    }
 }