diff -ur percona-server-5.7.28-31.orig/vio/viosslfactories.c percona-server-5.7.28-31/vio/viosslfactories.c
--- percona-server-5.7.28-31.orig/vio/viosslfactories.c	2019-12-16 23:44:00.665000000 +0100
+++ percona-server-5.7.28-31/vio/viosslfactories.c	2019-12-16 23:46:07.804000000 +0100
@@ -199,7 +199,7 @@
     key_file= cert_file;
 
   if (cert_file &&
-      SSL_CTX_use_certificate_file(ctx, cert_file, SSL_FILETYPE_PEM) <= 0)
+      SSL_CTX_use_certificate_chain_file(ctx, cert_file) <= 0)
   {
     *error= SSL_INITERR_CERT;
     DBUG_PRINT("error",("%s from file '%s'", sslGetErrString(*error), cert_file));