diff --git a/panda/src/express/error_utils.cxx b/panda/src/express/error_utils.cxx
index a5438029c7..355566423e 100644
--- a/panda/src/express/error_utils.cxx
+++ b/panda/src/express/error_utils.cxx
@@ -54,6 +54,8 @@ handle_socket_error(void) {
       return "Remote host is unreachable";
     case 10093:
       return "WSAStartup() was not called";
+    case 0:
+      return sterror(errno);
     default:
       if (express_cat.is_debug())
         express_cat.debug()