I'm trying to configure DSpace-CRIS 5.10 and DSpace 6.3 to use ldaps, but
get this error in the log:

2020-11-11 15:05:03,464 WARN  org.dspace.authenticate.LDAPAuthentication @
anonymous:session_id=F261C03287498D5AEE67FFE7F53CBCAF:ip_addr=10.0.36.134:ldap_authentication:type=failed_auth
javax.naming.CommunicationException\colon; simple bind failed\colon;
<server_url>\colon;636 [Root exception is
javax.net.ssl.SSLHandshakeException\colon; PKIX path building failed\colon;
sun.security.provider.certpath.SunCertPathBuilderException\colon; unable to
find valid certification path to requested target]

LDAP authentication is working without SSL. All I've changed in the
configuration is ldap -> ldaps in the provider_url property.

On the DSpace 6.3 server I've also tried:
authentication-ldap.starttls=true
while leaving the scheme at ldap

That results in the following error:

2020-11-12 09:06:32,112 WARN  org.dspace.authenticate.LDAPAuthentication @
anonymous:session_id=0BD2A90CE7458F21149D8505D76D7E78:ip_addr=10.0.36.134:ldap_authentication:type=failed_auth
javax.net.ssl.SSLHandshakeException\colon; PKIX path building failed\colon;
sun.security.provider.certpath.SunCertPathBuilderException\colon; unable to
find valid certification path to requested target

I also tried using ldapsearch and found that that fails on ldaps with the
error 'TLS: peer cert untrusted or revoked (0x142)' unless I add the
following line to /etc/ldap/ldap.conf:

TLS_REQCERT NEVER

That setting in ldap.conf doesn't seem to have any effect on DSpace; is
there a way of telling DSpace to not expect a server certificate? Or is
there a better way to get secure LDAP working?

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