https://bugs.openldap.org/show_bug.cgi?id=9210
--- Comment #5 from lukas.juhrich@agdsn.de lukas.juhrich@agdsn.de --- Quick update, I found a document from myself from the last debugging.
The return value in the loop is always `-408`, which is `GNUTLS_E_UNAVAILABLE_DURING_HANDSHAKE`.