Hi,
thank you for your report and your help to make Ubuntu better!

I checked the old bug and wondered as that got upstream in version 1.10
and Trusty onward is  >=1.11 so this issue should not occur on your
Ubuntu 16.04 system with sssd 1.13.

I found in the patches linked a note that mentioned:
"To avoid the problem mentioned in the ticket above, option 
dns_discovery_domain must be set properly."

It is documented as:
dns_discovery_domain (string)
  If service discovery is used in the back end, specifies
  the domain part of the service discovery DNS query.  
  Default: Use the domain part of machine's hostname

That should be a safe default IMHO, but did you set that in your config (or 
would you have to)?
Not sure I could find anything in it, but sharing your sssd config (if not 
confidential in any way) might be helpful.

I don't know your setup but in the past I often found it challenging to
verify sssd issues due to the setup complexity. As kind of a start to
check if that issue is fixed upstream as well I wanted to ask if you
could try your on a test system check with the new zesty release - that
is about to get the newer 1.14.2-1 the next few days (currently passing
through some tests, but should be there soon).

** Changed in: sssd (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1642486

Title:
  SSSD SRV Lookup Failover Fails when primary DNS Server is unresponsive

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