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This bug is created as a clone of upstream ticket:
https://pagure.io/SSSD/sssd/issue/3431

The IPA subdomains code only loaded the naming suffixes when the subdomains changed. As effect, just restarting sssd breaks logins with enterprise principals.

The workaround is to remove the cache.

master: fcfc1450a846519f2c74e864a12fad65aa54189b

master:
* a8a3fcbf6f75a7c2665e8bf503c186e07dfab333

sssd-1-14:
* 76957f07f79fb30634d2b5b4bed56cf30307c079

Created attachment 1388387 [details]
Console output and krb5_child log

Verified 
sssd-1.16.0-15.el7.x86_64

Now, "enterprise principal [true]", with UPN being used.


Attaching krb5_child log and Console output

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2018:0929