diff -up stunnel-5.58/src/ctx.c.openssl30 stunnel-5.58/src/ctx.c
--- stunnel-5.58/src/ctx.c.openssl30	2021-08-03 16:02:24.687409192 +0200
+++ stunnel-5.58/src/ctx.c	2021-08-03 16:03:36.889009510 +0200
@@ -1011,6 +1011,7 @@ NOEXPORT int ui_retry() {
         switch(ERR_GET_REASON(err)) {
         case UI_R_RESULT_TOO_LARGE:
         case UI_R_RESULT_TOO_SMALL:
+        case UI_R_PROCESSING_ERROR:
             return 1;
         default:
             return 0;