LDAPS with self signed certs broken in 21.7.4

[rene-bayer]

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Describe the bug

LDAPS authentication for VPN dialin worked without any problems before updating.
after updating I had to switch back to LDAP only (without encryption) to get it back working again.

opnsense-revert would also work - but I cant install plugins then.

To Reproduce

Steps to reproduce the behavior:

1. setup LDAP server with SSL (for example an Univention LDAP server)
2. add CA certificate (used for the ldap server certificate) under Trust -> Certificates -> Authorities
3. setup LDAPS accounting server
4. test Login

Error:

Expected behavior

Login succeed

Describe alternatives you considered

This worked with 21.7.3 - after upgrade to 21.7.4 this is broken.
Tested with two different setups

Screenshots

NaN

Relevant log files

NaN

Additional context

NaN

Environment

Software version used and hardware type if relevant, e.g.:

OPNsense 21.7.4-amd64
OpenSSL 1.1.1l 24 Aug 2021
Intel(R) Xeon(R) E-2224 CPU @ 3.40GHz (4 cores)

[AdSchellevis]

duplicate #5314, might also be fixed with #5323

[rene-bayer]

Oh god .... missed that one, sorry :-)