Oops, I was just missing the -H ldapi:/// along with the -Y EXTERNAL

Now the following works (well, with slapd, not with the textarea on this
site, WTF? :-( ):

ldapmodify -Y EXTERNAL -H ldapi:/// <<'EOF'
dn: cn=config
changetype: modify
replace: olcTLSCipherSuite
olcTLSCipherSuite: 
SECURE:-VERS-SSL3.0:-3DES-CBC:-ARCFOUR-128:%SERVER_PRECEDENCE:%SAFE_RENEGOTIATION:%FALLBACK_SCSV
EOF


%SERVER_PRECEDENCE does fix the "server cipher order" => good

However %FALLBACK_SCSV fails to fix "TLS_FALLBACK_SCSV (RFC 7507)" which
now says "some unexpected "handshake failure" instead of "inappropriate
fallback" (likely NOT ok)"

Moreover, %SAFE_RENEGOTIATION fails to fix "Secure Client-Initiated
Renegotiation", it still says VULNERABLE (NOT ok), DoS threat. Or maybe,
there's a different setting needed for that?

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https://bugs.launchpad.net/bugs/1591681

Title:
  Impossible to configure GnuTLS'  %SERVER_PRECEDENCE setting in slapd

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