On 07 May 2020, at 18:51, Graham Leggett <minfrin@xxxxxxxx> wrote: > I have two servers, an older CentOS7 server running 389-ds-base-1.3.10.1-5.el7, and a newer CentOS8 server running 389-ds-base-1.4.1.3-7.module_el8.1.0+234+96aec258, and I want to set up multi-master-replication between them. > > The replication agreement for CentOS7-> CentOS8 works great, replication is working fine. > > The replication agreement for CentOS8 -> CentOS7 doesn’t work, giving the following strange error: > > [07/May/2020:18:42:59.201795217 +0200] - ERR - slapi_ldap_bind - Could not send bind request for id [cn=Replication Manager,cn=config] authentication mechanism [SIMPLE]: error -1 (Can't contact LDAP server), system error -5987 (Invalid function argument.), network error 0 (Unknown error, host “x.x.x:636”) > > At the core of the above message is "network error 0”, otherwise known as “success”. > > Does this ring a bell with anyone? Some googling sees me unearth this worrying thread: https://pagure.io/389-ds-base/issue/47536 Quite a while back I spent an enormous amount of debugging time on an Ubuntu version of 389ds that refused point blank to replicate. We eventually discovered an awful bug where 389ds had been bound to two competing SSL libraries, GnuTLS and NSS, and 389ds was passing NSS parameters (directory paths) to GnuTLS, which was silently failing and then eating error messages. We concluded Ubuntu was too broken to fix in any reasonable time and moved all LDAP servers to CentOS7, which worked. Doing an ldd /usr/sbin/ns-slapd shows that on CentOS8 389ds is linked to both NSS and OpenSSL, which looks worryingly like the same bug has crept into CentOS8. Anyone have any details? Regards, Graham —
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