diff --git a/src/csync/csync_exclude.h b/src/csync/csync_exclude.h
index 0656371e792fe..d06c5e107d359 100644
--- a/src/csync/csync_exclude.h
+++ b/src/csync/csync_exclude.h
@@ -43,7 +43,8 @@ enum CSYNC_EXCLUDE_TYPE {
   CSYNC_FILE_EXCLUDE_HIDDEN,
   CSYNC_FILE_EXCLUDE_STAT_FAILED,
   CSYNC_FILE_EXCLUDE_CONFLICT,
-  CSYNC_FILE_EXCLUDE_CANNOT_ENCODE
+  CSYNC_FILE_EXCLUDE_CANNOT_ENCODE,
+  CSYNC_FILE_EXCLUDE_SERVER_BLACKLISTED,
 };
 
 class ExcludedFilesTest;
diff --git a/src/libsync/capabilities.cpp b/src/libsync/capabilities.cpp
index b6a689fcdafe7..1ea4a58dca39e 100644
--- a/src/libsync/capabilities.cpp
+++ b/src/libsync/capabilities.cpp
@@ -208,6 +208,11 @@ bool Capabilities::uploadConflictFiles() const
     return _capabilities[QStringLiteral("uploadConflictFiles")].toBool();
 }
 
+QStringList Capabilities::blacklistedFiles() const
+{
+    return _capabilities["files"].toMap()["blacklisted_files"].toStringList();
+}
+
 /*-------------------------------------------------------------------------------------*/
 
 // Direct Editing
diff --git a/src/libsync/capabilities.h b/src/libsync/capabilities.h
index dae0d586643a3..e64f68d0b71f0 100644
--- a/src/libsync/capabilities.h
+++ b/src/libsync/capabilities.h
@@ -126,6 +126,11 @@ class OWNCLOUDSYNC_EXPORT Capabilities
      */
     QString invalidFilenameRegex() const;
 
+    /**
+     * return the list of filename that should not be uploaded
+     */
+    QStringList blacklistedFiles() const;
+
     /**
      * Whether conflict files should remain local (default) or should be uploaded.
      */
diff --git a/src/libsync/discovery.cpp b/src/libsync/discovery.cpp
index 64984f7ea1375..13f013efc5f5d 100644
--- a/src/libsync/discovery.cpp
+++ b/src/libsync/discovery.cpp
@@ -142,7 +142,9 @@ void ProcessDirectoryJob::process()
         // local stat function.
         // Recall file shall not be ignored (#4420)
         bool isHidden = e.localEntry.isHidden || (f.first[0] == '.' && f.first != QLatin1String(".sys.admin#recall#"));
-        if (handleExcluded(path._target, e.localEntry.isDirectory || e.serverEntry.isDirectory, isHidden, e.localEntry.isSymLink))
+        if (handleExcluded(path._target, e.localEntry.name,
+                e.localEntry.isDirectory || e.serverEntry.isDirectory, isHidden,
+                e.localEntry.isSymLink))
             continue;
 
         if (_queryServer == InBlackList || _discoveryData->isInSelectiveSyncBlackList(path._original)) {
@@ -154,7 +156,7 @@ void ProcessDirectoryJob::process()
     QTimer::singleShot(0, _discoveryData, &DiscoveryPhase::scheduleMoreJobs);
 }
 
-bool ProcessDirectoryJob::handleExcluded(const QString &path, bool isDirectory, bool isHidden, bool isSymlink)
+bool ProcessDirectoryJob::handleExcluded(const QString &path, const QString &localName, bool isDirectory, bool isHidden, bool isSymlink)
 {
     auto excluded = _discoveryData->_excludes->traversalPatternMatch(path, isDirectory ? ItemTypeDirectory : ItemTypeFile);
 
@@ -169,6 +171,11 @@ bool ProcessDirectoryJob::handleExcluded(const QString &path, bool isDirectory,
     if (excluded == CSYNC_NOT_EXCLUDED && _discoveryData->_ignoreHiddenFiles && isHidden) {
         excluded = CSYNC_FILE_EXCLUDE_HIDDEN;
     }
+    if (excluded == CSYNC_NOT_EXCLUDED && !localName.isEmpty()
+            && _discoveryData->_serverBlacklistedFiles.contains(localName)) {
+        excluded = CSYNC_FILE_EXCLUDE_SERVER_BLACKLISTED;
+        isInvalidPattern = true;
+    }
 
     auto localCodec = QTextCodec::codecForLocale();
     if (localCodec->mibEnum() != 106) {
@@ -248,6 +255,9 @@ bool ProcessDirectoryJob::handleExcluded(const QString &path, bool isDirectory,
         case CSYNC_FILE_EXCLUDE_CANNOT_ENCODE:
             item->_errorString = tr("The filename cannot be encoded on your file system.");
             break;
+        case CSYNC_FILE_EXCLUDE_SERVER_BLACKLISTED:
+            item->_errorString = tr("The filename is blacklisted on the server.");
+            break;
         }
     }
 
diff --git a/src/libsync/discovery.h b/src/libsync/discovery.h
index 99d0013b12f5a..0ec44b9408454 100644
--- a/src/libsync/discovery.h
+++ b/src/libsync/discovery.h
@@ -116,8 +116,10 @@ class ProcessDirectoryJob : public QObject
      */
     void process();
 
-    // return true if the file is excluded
-    bool handleExcluded(const QString &path, bool isDirectory, bool isHidden, bool isSymlink);
+    // return true if the file is excluded.
+    // path is the full relative path of the file. localName is the base name of the local entry.
+    bool handleExcluded(const QString &path, const QString &localName, bool isDirectory,
+        bool isHidden, bool isSymlink);
 
     /** Reconcile local/remote/db information for a single item.
      *
diff --git a/src/libsync/discoveryphase.h b/src/libsync/discoveryphase.h
index 6f6b4ffd6bb8d..738c2d2122b38 100644
--- a/src/libsync/discoveryphase.h
+++ b/src/libsync/discoveryphase.h
@@ -170,6 +170,7 @@ class DiscoveryPhase : public QObject
     QStringList _selectiveSyncWhiteList;
     ExcludedFiles *_excludes;
     QRegExp _invalidFilenameRx; // FIXME: maybe move in ExcludedFiles
+    QStringList _serverBlacklistedFiles; // The blacklist from the capabilities
     bool _ignoreHiddenFiles = false;
     std::function<bool(const QString &)> _shouldDiscoverLocaly;
 
diff --git a/src/libsync/syncengine.cpp b/src/libsync/syncengine.cpp
index 418d494fcd1c4..ba1d0d6bae0e2 100644
--- a/src/libsync/syncengine.cpp
+++ b/src/libsync/syncengine.cpp
@@ -608,6 +608,7 @@ void SyncEngine::slotStartDiscovery()
     }
     if (!invalidFilenamePattern.isEmpty())
         _discoveryPhase->_invalidFilenameRx = QRegExp(invalidFilenamePattern);
+    _discoveryPhase->_serverBlacklistedFiles = _account->capabilities().blacklistedFiles();
     _discoveryPhase->_ignoreHiddenFiles = ignoreHiddenFiles();
 
     connect(_discoveryPhase.data(), &DiscoveryPhase::itemDiscovered, this, &SyncEngine::slotItemDiscovered);
diff --git a/test/testlocaldiscovery.cpp b/test/testlocaldiscovery.cpp
index babc91bd8a8d3..d1831a56da0eb 100644
--- a/test/testlocaldiscovery.cpp
+++ b/test/testlocaldiscovery.cpp
@@ -185,7 +185,25 @@ private slots:
         QCOMPARE(fakeFolder.currentRemoteState(), expectedState);
     }
 
+    // Tests the behavior of invalid filename detection
+    void testServerBlacklist()
+    {
+        FakeFolder fakeFolder { FileInfo::A12_B12_C12_S12() };
+        QCOMPARE(fakeFolder.currentLocalState(), fakeFolder.currentRemoteState());
+
+        fakeFolder.syncEngine().account()->setCapabilities({ { "files",
+            QVariantMap { { "blacklisted_files", QVariantList { ".foo", "bar" } } } } });
+        fakeFolder.localModifier().insert("C/.foo");
+        fakeFolder.localModifier().insert("C/bar");
+        fakeFolder.localModifier().insert("C/moo");
+        fakeFolder.localModifier().insert("C/.moo");
 
+        QVERIFY(fakeFolder.syncOnce());
+        QVERIFY(fakeFolder.currentRemoteState().find("C/moo"));
+        QVERIFY(fakeFolder.currentRemoteState().find("C/.moo"));
+        QVERIFY(!fakeFolder.currentRemoteState().find("C/.foo"));
+        QVERIFY(!fakeFolder.currentRemoteState().find("C/bar"));
+    }
 };
 
 QTEST_GUILESS_MAIN(TestLocalDiscovery)