diff --git a/src/allmydata/client.py b/src/allmydata/client.py
index a2f88ebd6..645e157b6 100644
--- a/src/allmydata/client.py
+++ b/src/allmydata/client.py
@@ -36,7 +36,7 @@ from twisted.python.filepath import FilePath
 import allmydata
 from allmydata.crypto import rsa, ed25519
 from allmydata.crypto.util import remove_prefix
-from allmydata.storage.server import StorageServer
+from allmydata.storage.server import StorageServer, FoolscapStorageServer
 from allmydata import storage_client
 from allmydata.immutable.upload import Uploader
 from allmydata.immutable.offloaded import Helper
@@ -834,7 +834,7 @@ class _Client(node.Node, pollmixin.PollMixin):
 
         if anonymous_storage_enabled(self.config):
             furl_file = self.config.get_private_path("storage.furl").encode(get_filesystem_encoding())
-            furl = self.tub.registerReference(ss, furlFile=furl_file)
+            furl = self.tub.registerReference(FoolscapStorageServer(ss), furlFile=furl_file)
             announcement["anonymous-storage-FURL"] = furl
 
         enabled_storage_servers = self._enable_storage_servers(
diff --git a/src/allmydata/storage/immutable.py b/src/allmydata/storage/immutable.py
index 08b83cd87..173a43e8e 100644
--- a/src/allmydata/storage/immutable.py
+++ b/src/allmydata/storage/immutable.py
@@ -382,7 +382,7 @@ class BucketReader(Referenceable):  # type: ignore # warner/foolscap#78
         return data
 
     def remote_advise_corrupt_share(self, reason):
-        return self.ss.remote_advise_corrupt_share(b"immutable",
-                                                   self.storage_index,
-                                                   self.shnum,
-                                                   reason)
+        return self.ss.advise_corrupt_share(b"immutable",
+                                            self.storage_index,
+                                            self.shnum,
+                                            reason)
diff --git a/src/allmydata/storage/server.py b/src/allmydata/storage/server.py
index 9d3ac4012..5dd8cd0bc 100644
--- a/src/allmydata/storage/server.py
+++ b/src/allmydata/storage/server.py
@@ -127,6 +127,9 @@ class StorageServer(service.MultiService):
         # Map in-progress filesystem path -> BucketWriter:
         self._bucket_writers = {}  # type: Dict[str,BucketWriter]
 
+        # These callables will be called with BucketWriters that closed:
+        self._call_on_bucket_writer_close = []
+
     def stopService(self):
         # Cancel any in-progress uploads:
         for bw in list(self._bucket_writers.values()):
@@ -405,9 +408,14 @@ class StorageServer(service.MultiService):
         if self.stats_provider:
             self.stats_provider.count('storage_server.bytes_added', consumed_size)
         del self._bucket_writers[bw.incominghome]
-        if bw in self._bucket_writer_disconnect_markers:
-            canary, disconnect_marker = self._bucket_writer_disconnect_markers.pop(bw)
-            canary.dontNotifyOnDisconnect(disconnect_marker)
+        for handler in self._call_on_bucket_writer_close:
+            handler(bw)
+
+    def register_bucket_writer_close_handler(self, handler):
+        """
+        The handler will be called with any ``BucketWriter`` that closes.
+        """
+        self._call_on_bucket_writer_close.append(handler)
 
     def _get_bucket_shares(self, storage_index):
         """Return a list of (shnum, pathname) tuples for files that hold
@@ -755,9 +763,15 @@ class FoolscapStorageServer(Referenceable):  # type: ignore # warner/foolscap#78
         # Canaries and disconnect markers for BucketWriters created via Foolscap:
         self._bucket_writer_disconnect_markers = {}  # type: Dict[BucketWriter,Tuple[IRemoteReference, object]]
 
+        self._server.register_bucket_writer_close_handler(self._bucket_writer_closed)
+
+    def _bucket_writer_closed(self, bw):
+        if bw in self._bucket_writer_disconnect_markers:
+            canary, disconnect_marker = self._bucket_writer_disconnect_markers.pop(bw)
+            canary.dontNotifyOnDisconnect(disconnect_marker)
 
     def remote_get_version(self):
-        return self.get_version()
+        return self._server.get_version()
 
     def remote_allocate_buckets(self, storage_index,
                                 renew_secret, cancel_secret,
@@ -797,7 +811,7 @@ class FoolscapStorageServer(Referenceable):  # type: ignore # warner/foolscap#78
         )
 
     def remote_slot_readv(self, storage_index, shares, readv):
-        return self._server.slot_readv(self, storage_index, shares, readv)
+        return self._server.slot_readv(storage_index, shares, readv)
 
     def remote_advise_corrupt_share(self, share_type, storage_index, shnum,
                                     reason):