>openssl s_client -connect ldap.company.de:389 -starttls ldap
CONNECTED(00000003)
140557505041728:error:1425F102:SSL routines:ssl_choose_client_version:unsupported protocol:../ssl/statem/statem_lib.c:1941:
---
no peer certificate available
---
No client certificate CA names sent
---
SSL handshake has read 93 bytes and written 346 bytes
Verification: OK
---
New, (NONE), Cipher is (NONE)
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
Early data was not sent
Verify return code: 0 (ok)
---

>