Patch-Source: https://github.com/nginx/unit/pull/1601
--- a/src/nxt_openssl.c
+++ b/src/nxt_openssl.c
@@ -1586,6 +1586,12 @@
 
         nxt_debug(task, "ERR_peek_error(): %l", lib_err);
 
+        /* Treat a broken pipe on shutdown as a normal close */
+        if (sys_err == EPIPE) {
+            c->socket.closed = 1;
+            return 0;
+        }
+
         if (sys_err != 0 || lib_err != 0) {
             c->socket.error = sys_err;
             return NXT_ERROR;