diff --git a/changes/ticket33491 b/changes/ticket33491
new file mode 100644
index 0000000000..595ea863ea
--- /dev/null
+++ b/changes/ticket33491
@@ -0,0 +1,6 @@
+  o Major bugfixes (DoS defenses, bridges, pluggable transport):
+    - DoS subsystem was not given the transport name of the client connection
+      when tor is a bridge and thus failing to find the GeoIP cache entry for
+      that client address. This resulted in failing to apply DoS defenses on
+      bridges with a pluggable transport. Fixes bug 33491; bugfix on
+      0.3.3.2-alpha.
diff --git a/src/core/or/channel.c b/src/core/or/channel.c
index fd7bf62789..3886906875 100644
--- a/src/core/or/channel.c
+++ b/src/core/or/channel.c
@@ -1871,7 +1871,7 @@ channel_do_open_actions(channel_t *chan)
         tor_free(transport_name);
         /* Notify the DoS subsystem of a new client. */
         if (tlschan && tlschan->conn) {
-          dos_new_client_conn(tlschan->conn);
+          dos_new_client_conn(tlschan->conn, transport_name);
         }
       }
       /* Otherwise the underlying transport can't tell us this, so skip it */
diff --git a/src/core/or/dos.c b/src/core/or/dos.c
index 5f9bbf90ab..d06eaa6d05 100644
--- a/src/core/or/dos.c
+++ b/src/core/or/dos.c
@@ -671,7 +671,7 @@ dos_log_heartbeat(void)
 /* Called when a new client connection has been established on the given
  * address. */
 void
-dos_new_client_conn(or_connection_t *or_conn)
+dos_new_client_conn(or_connection_t *or_conn, const char *transport_name)
 {
   clientmap_entry_t *entry;
 
@@ -692,7 +692,7 @@ dos_new_client_conn(or_connection_t *or_conn)
   }
 
   /* We are only interested in client connection from the geoip cache. */
-  entry = geoip_lookup_client(&or_conn->real_addr, NULL,
+  entry = geoip_lookup_client(&or_conn->real_addr, transport_name,
                               GEOIP_CLIENT_CONNECT);
   if (BUG(entry == NULL)) {
     /* Should never happen because we note down the address in the geoip
diff --git a/src/core/or/dos.h b/src/core/or/dos.h
index 95448d0530..058b7afce6 100644
--- a/src/core/or/dos.h
+++ b/src/core/or/dos.h
@@ -53,7 +53,8 @@ int dos_enabled(void);
 void dos_log_heartbeat(void);
 void dos_geoip_entry_about_to_free(const struct clientmap_entry_t *geoip_ent);
 
-void dos_new_client_conn(or_connection_t *or_conn);
+void dos_new_client_conn(or_connection_t *or_conn,
+                         const char *transport_name);
 void dos_close_client_conn(const or_connection_t *or_conn);
 
 int dos_should_refuse_single_hop_client(void);
diff --git a/src/test/test_dos.c b/src/test/test_dos.c
index 4756c5014e..01d7cd006e 100644
--- a/src/test/test_dos.c
+++ b/src/test/test_dos.c
@@ -79,7 +79,7 @@ test_dos_conn_creation(void *arg)
   { /* Register many conns from this client but not enough to get it blocked */
     unsigned int i;
     for (i = 0; i < max_concurrent_conns; i++) {
-      dos_new_client_conn(&or_conn);
+      dos_new_client_conn(&or_conn, NULL);
     }
   }
 
@@ -88,7 +88,7 @@ test_dos_conn_creation(void *arg)
             dos_conn_addr_get_defense_type(addr));
 
   /* Register another conn and check that new conns are not allowed anymore */
-  dos_new_client_conn(&or_conn);
+  dos_new_client_conn(&or_conn, NULL);
   tt_int_op(DOS_CONN_DEFENSE_CLOSE, OP_EQ,
             dos_conn_addr_get_defense_type(addr));
 
@@ -98,7 +98,7 @@ test_dos_conn_creation(void *arg)
             dos_conn_addr_get_defense_type(addr));
 
   /* Register another conn and see that defense measures get reactivated */
-  dos_new_client_conn(&or_conn);
+  dos_new_client_conn(&or_conn, NULL);
   tt_int_op(DOS_CONN_DEFENSE_CLOSE, OP_EQ,
             dos_conn_addr_get_defense_type(addr));
 
@@ -153,7 +153,7 @@ test_dos_circuit_creation(void *arg)
    * circuit counting subsystem */
   geoip_note_client_seen(GEOIP_CLIENT_CONNECT, addr, NULL, now);
   for (i = 0; i < min_conc_conns_for_cc ; i++) {
-    dos_new_client_conn(&or_conn);
+    dos_new_client_conn(&or_conn, NULL);
   }
 
   /* Register new circuits for this client and conn, but not enough to get
@@ -217,7 +217,7 @@ test_dos_bucket_refill(void *arg)
 
   /* Register this client */
   geoip_note_client_seen(GEOIP_CLIENT_CONNECT, addr, NULL, now);
-  dos_new_client_conn(&or_conn);
+  dos_new_client_conn(&or_conn, NULL);
 
   /* Fetch this client from the geoip cache and get its DoS structs */
   clientmap_entry_t *entry = geoip_lookup_client(addr, NULL,
@@ -460,11 +460,11 @@ test_known_relay(void *arg)
   geoip_note_client_seen(GEOIP_CLIENT_CONNECT, &or_conn.real_addr, NULL, 0);
   /* Suppose we have 5 connections in rapid succession, the counter should
    * always be 0 because we should ignore this. */
-  dos_new_client_conn(&or_conn);
-  dos_new_client_conn(&or_conn);
-  dos_new_client_conn(&or_conn);
-  dos_new_client_conn(&or_conn);
-  dos_new_client_conn(&or_conn);
+  dos_new_client_conn(&or_conn, NULL);
+  dos_new_client_conn(&or_conn, NULL);
+  dos_new_client_conn(&or_conn, NULL);
+  dos_new_client_conn(&or_conn, NULL);
+  dos_new_client_conn(&or_conn, NULL);
   entry = geoip_lookup_client(&or_conn.real_addr, NULL, GEOIP_CLIENT_CONNECT);
   tt_assert(entry);
   /* We should have a count of 0. */
@@ -474,8 +474,8 @@ test_known_relay(void *arg)
    * connection and see if we do get it. */
   tor_addr_parse(&or_conn.real_addr, "42.42.42.43");
   geoip_note_client_seen(GEOIP_CLIENT_CONNECT, &or_conn.real_addr, NULL, 0);
-  dos_new_client_conn(&or_conn);
-  dos_new_client_conn(&or_conn);
+  dos_new_client_conn(&or_conn, NULL);
+  dos_new_client_conn(&or_conn, NULL);
   entry = geoip_lookup_client(&or_conn.real_addr, NULL, GEOIP_CLIENT_CONNECT);
   tt_assert(entry);
   /* We should have a count of 2. */