What were you trying to do that didn't work?

I'm trying to configure HAProxy backend to use IPv6 to connect to LDAP server:

backend ldap
    balance     roundrobin
    server ldap1 [::1]:389 send-proxy

But the server doesn't accept it:

[12/Feb/2024:05:35:07.024868922 -0500] conn=28 fd=64 slot=64 connection from ::1 to ::1
[12/Feb/2024:05:35:07.025052017 -0500] conn=28 op=-1 fd=64 Disconnect - Protocol error - Unknown Proxy - P4

Even though nsslapd-haproxy-trusted-ip is set to ::1

Please provide the package NVR for which bug is seen:

389-ds-base-2.4.5-3.el9.x86_64

How reproducible:

always

Steps to reproduce

1.  Configure HAProxy backend to connect via IPv6 to LDAP server
2.  Set nsslapd-haproxy-trusted-ip to ::1
3.  Issue ldapsearch command to HAProxy IP:Port

Expected results

Request should be successful

Actual results

# ldapsearch -D cn=Directory\ Manager -w password -H ldap://haproxy:3389
ldap_result: Can't contact LDAP server (-1)