Hello Alex,
I think we need a bit more information here.

First of all, could you please run the "dsconf repl-agmt create" (LDAPS
one) with "-v" flag? It will give a detailed verbose output.
Also, I recommend checking the server's error and access log for more
information why it fails (additionally, you may enable at least 16384+8192
(Default + Replication debugging) in nsslapd-errorlog-level).

As for possible issues and actions, at first glance, I recommend checking
that the TLS certificates used are correctly installed and trusted on both
the supplier and consumer instances. It's important that the instances
trust each other; even though ldapsearch (OpenLDAP client) on the supplier
already trusts the consumer machine, it's not enough.

Sincerely,
Simon



On Thu, Jan 25, 2024 at 1:07 PM Nazarenko, Alexander <
alexander_nazare...@harvard.edu> wrote:

> Hello colleagues,
>
>
>
> Lately we started looking into 389 DS 2.3.6 on RHEL 9 platform.
>
>
>
> We followed instructions Configuring and managing replication
> <https://access.redhat.com/documentation/en-us/red_hat_directory_server/12/html-single/configuring_and_managing_replication/index>
> on Red Hat site to establish replication between two remote instances,
>
> The instances where previously configured to support TLS channel on port
> 636 (Enabling TLS-encrypted connections to Directory Server
> <https://access.redhat.com/documentation/en-us/red_hat_directory_server/12/html/securing_red_hat_directory_server/assembly_enabling-tls-encrypted-connections-to-directory-server_securing-rhds>
> ) , and we made sure ldapsearch is working with LDAPS:// protocol with
> the certificate verification (TLS_REQCERT demand).
>
>
>
> The following issue with the replication over TLS was observed:
>
>
>
> After we ran the command below to configure secure replication:
>
> dsconf -D "cn=Directory Manager"  -w *** ldaps://server.example.edu
> repl-agmt create --suffix "dc=example,dc=com" --host "consumer.example.edu"
> --port 636 --conn-protocol=LDAPS --bind-dn "cn=replication
> manager,cn=config" --bind-passwd "***" --bind-method=SIMPLE --init
> consumer.example.edu-RO
>
>
>
> the error occurred:
>
> Error (-1) Problem connecting to replica - LDAP error: Can't contact LDAP
> server (connection error)
>
>
>
> We double-checked that after we configure clear text replication with the
> command:
>
> dsconf -D "cn=Directory Manager"  -w *** ldaps://server.example.edu
> repl-agmt create --suffix "dc=example,dc=com" --host "consumer.example.edu"
> --port 389 --conn-protocol=LDAP --bind-dn "cn=replication
> manager,cn=config" --bind-passwd "***" --bind-method=SIMPLE --init
> 10.140.133.36-RO
>
>
>
> no problem occurred, and the replication completed successfully.
>
>
>
> My question is whether this means the replication over TLS required
> different config steps, and if yes – what they are?
>
>
>
> Thank you,
>
> - Alex
>
>
> --
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