Trying to understand the query mechanism used to determine the root DSE
This is using SASL to get this information. A couple queries from a Linux command line can be performed to verify availability of mechanisms:
ldapsearch -x -H ldaps://example.com:636 -s base -b "" "supportedSASLMechanisms"
The following will test if data can be returned:
ldapsearch -x -H ldaps://example.com:636 -s base -b "" "(objectclass=*)" "+"