--- a/src/core/ngx_connection.c
+++ b/src/core/ngx_connection.c
@@ -603,6 +603,8 @@ ngx_close_listening_sockets(ngx_cycle_t 
             ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_socket_errno,
                           ngx_close_socket_n " %V failed", &ls[i].addr_text);
         }
+
+        ls[i].fd = (ngx_socket_t) -1;
     }
 }
 

--- a/src/os/win32/ngx_process_cycle.c
+++ b/src/os/win32/ngx_process_cycle.c
@@ -208,6 +208,8 @@ ngx_master_process_cycle(ngx_cycle_t *cy
 
             ngx_cycle = cycle;
 
+            ngx_close_listening_sockets(cycle);
+
             if (ngx_start_worker_processes(cycle, NGX_PROCESS_JUST_RESPAWN)) {
                 ngx_quit_worker_processes(cycle, 1);
             }