On bionic, with sssd 1.16.1-1ubuntu1.6, tshark is telling me that the 
connection in port 389 is using "GSS-API integrity":
   83 177.024452189    10.51.0.5 _ 10.51.0.15   LDAP 112 bindResponse(3) 
saslBindInProgress
   84 177.024514712   10.51.0.15 _ 10.51.0.5    LDAP 112 bindRequest(4) 
"<ROOT>" sasl
   85 177.024804697    10.51.0.5 _ 10.51.0.15   LDAP 80 bindResponse(4) success
   86 177.024966894   10.51.0.15 _ 10.51.0.5    LDAP 204 SASL GSS-API Integrity:

Ok, I got a 2889 event when I did a simple bind on port 389, which is
expected. At least shows the logging seems fine. And once I configure
TLS and use -ZZ on that simple bind, it works even on port 389.

So what are the scenarios where sssd would use unencrypted connections
on port 389? I think for nss, but in the AD scenario, these are all
using gss-api integrity, no? Is this for setups where the AD integration
from sssd is using just ldap, and not kerberos?

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https://bugs.launchpad.net/bugs/1868703

Title:
  Backport ad_use_ldaps because of ADV190023

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