diff --git a/be_misc.c b/be_misc.c
index 7f50a643..de15a34e 100644
--- a/be_misc.c
+++ b/be_misc.c
@@ -29,7 +29,10 @@ void backend_socket_log(Seat *seat, LogContext *logctx,
         msg = dupprintf("Failed to connect to %s: %s", addrbuf, error_msg);
         break;
       case PLUGLOG_CONNECT_SUCCESS:
-        sk_getaddr(addr, addrbuf, lenof(addrbuf));
+        if (addr)
+            sk_getaddr(addr, addrbuf, lenof(addrbuf));
+        else /* fallback if address unavailable */
+            sprintf(addrbuf, "remote host");
         msg = dupprintf("Connected to %s", addrbuf);
         break;
       case PLUGLOG_PROXY_MSG: {
diff --git a/network.h b/network.h
index 92662ac7..05b71279 100644
--- a/network.h
+++ b/network.h
@@ -67,8 +67,11 @@ struct PlugVtable {
      *    addresses to fall back to. When it _is_ fatal, the closing()
      *    function will be called.
      *
-     *  - PLUGLOG_CONNECT_SUCCESS means we have succeeded in
-     *    connecting to address `addr'.
+     *  - PLUGLOG_CONNECT_SUCCESS means we have succeeded in making a
+     *    connection. `addr' gives the address we connected to, if
+     *    available. (But sometimes, in cases of complicated proxy
+     *    setups, it might not be available, so receivers of this log
+     *    event should be prepared to deal with addr==NULL.)
      *
      *  - PLUGLOG_PROXY_MSG means that error_msg contains a line of
      *    logging information from whatever the connection is being
diff --git a/proxy.c b/proxy.c
index 1a737cae..4fa8f16f 100644
--- a/proxy.c
+++ b/proxy.c
@@ -28,6 +28,8 @@ void proxy_activate (ProxySocket *p)
 
     p->state = PROXY_STATE_ACTIVE;
 
+    plug_log(p->plug, PLUGLOG_CONNECT_SUCCESS, NULL, 0, NULL, 0);
+
     /* we want to ignore new receive events until we have sent
      * all of our buffered receive data.
      */
diff --git a/unix/fd-socket.c b/unix/fd-socket.c
index 6c468e6b..afd37957 100644
--- a/unix/fd-socket.c
+++ b/unix/fd-socket.c
@@ -315,6 +315,12 @@ static const SocketVtable FdSocket_sockvt = {
     .peer_info = NULL,
 };
 
+static void fdsocket_connect_success_callback(void *ctx)
+{
+    FdSocket *fds = (FdSocket *)ctx;
+    plug_log(fds->plug, PLUGLOG_CONNECT_SUCCESS, NULL, 0, NULL, 0);
+}
+
 Socket *make_fd_socket(int infd, int outfd, int inerrfd, Plug *plug)
 {
     FdSocket *fds;
@@ -354,5 +360,7 @@ Socket *make_fd_socket(int infd, int outfd, int inerrfd, Plug *plug)
         uxsel_set(fds->inerrfd, SELECT_R, fdsocket_select_result_input_error);
     }
 
+    queue_toplevel_callback(fdsocket_connect_success_callback, fds);
+
     return &fds->sock;
 }
diff --git a/windows/handle-socket.c b/windows/handle-socket.c
index 93bb500a..77b9067c 100644
--- a/windows/handle-socket.c
+++ b/windows/handle-socket.c
@@ -314,6 +314,12 @@ static const SocketVtable HandleSocket_sockvt = {
     .peer_info = sk_handle_peer_info,
 };
 
+static void sk_handle_connect_success_callback(void *ctx)
+{
+    HandleSocket *hs = (HandleSocket *)ctx;
+    plug_log(hs->plug, PLUGLOG_CONNECT_SUCCESS, NULL, 0, NULL, 0);
+}
+
 Socket *make_handle_socket(HANDLE send_H, HANDLE recv_H, HANDLE stderr_H,
                            Plug *plug, bool overlapped)
 {
@@ -339,5 +345,7 @@ Socket *make_handle_socket(HANDLE send_H, HANDLE recv_H, HANDLE stderr_H,
 
     hs->defer_close = hs->deferred_close = false;
 
+    queue_toplevel_callback(sk_handle_connect_success_callback, hs);
+
     return &hs->sock;
 }