Hi, I setup an IPA realm (under rhel7) with an trust relationship to a Windows 
domain. All users in AD have an idoverride to override uid and gid.
Originally, everything was working like expected: servers could resolve IPA and 
external (trusted) users, I could create kerberos tickets, log-in via ssh... 
Same for IPA clients.
But recently (two weeks ago?), I tried login to an IPA client using an external 
user and got denied... Debugging, I saw that id and getent wasn't returning any 
external users, but could return IPA users.
Digging a bit more: the ipa servers themselves could resolve both IPA and 
external users like before.
I tried fumbling around in the sssd, but to no avail... I bumped the debug 
level of the sssd to 9 on the client and the server and this is what I can 
observe:

0) configure sssd on client to only point to a single IPA server (easier to 
debug), on that specific IPA server, only point to a single AD server, clear 
cache and logs, restart sssd on server and client
1) on client, issue 'id myuser' (no domain name, I configured 
use_fully_qualified_names to False for the domain) -> user unknown
2) client logs:
[sssd[be[ipa.domain]]] [dp_get_account_info_handler] (0x0200): Got request for 
[0x1][BE_REQ_USER][name=myuser@ipa.domain]
-> it then saw it's an external user:
[sssd[be[ipa.domain]]] [dp_get_account_info_handler] (0x0200): Got request for 
[0x1][BE_REQ_USER][name=myuser@ad.domain]
-> so it sent the request to IPA:
[sssd[be[ipa.domain]]] [ipa_s2n_get_acct_info_send] (0x0400): Sending 
request_type: [REQ_FULL_WITH_MEMBERS] for trust user [myuser@ad.domain] to IPA 
server
Spoiler-alert: it fails with:
[sssd[be[ipa.domain]]] [sysdb_search_user_by_upn] (0x0400): No entry with upn 
[myuser@ad.domain] found.

On the server-side, I receive the request:
[sssd[be[ipa.domain]]] [dp_get_account_info_handler] (0x0200): Got request for 
[0x1][BE_REQ_USER][name=myuser@ad.domain]
It resolves the user - fetch all its groups in Windows and seems to process 
everything correctly (sid resolve...) but I can't find what's the return/status 
of the request. Seems like this:

(Thu Oct 10 11:27:32 2019) [sssd[be[ipa.domain]]] [sdap_id_op_connect_step] 
(0x4000): reusing cached connection
(Thu Oct 10 11:27:32 2019) [sssd[be[ipa.domain]]] [get_ldap_conn_from_sdom_pvt] 
(0x4000): Returning LDAP connection for user lookup.
(Thu Oct 10 11:27:32 2019) [sssd[be[ipa.domain]]] [sdap_id_op_connect_step] 
(0x4000): beginning to connect
(Thu Oct 10 11:27:32 2019) [sssd[be[ipa.domain]]] [fo_resolve_service_send] 
(0x0100): Trying to resolve service 'sd_ad.domain.root'
(Thu Oct 10 11:27:32 2019) [sssd[be[ipa.domain]]] [get_server_status] (0x1000): 
Status of server 'a08238.ad.domain.root' is 'name resolved'
(Thu Oct 10 11:27:32 2019) [sssd[be[ipa.domain]]] 
[fo_resolve_service_activate_timeout] (0x2000): Resolve timeout set to 6 seconds
(Thu Oct 10 11:27:32 2019) [sssd[be[ipa.domain]]] [resolve_srv_send] (0x0200): 
The status of SRV lookup is resolved
(Thu Oct 10 11:27:32 2019) [sssd[be[ipa.domain]]] [get_server_status] (0x1000): 
Status of server 'a08238.ad.domain.root' is 'name resolved'
(Thu Oct 10 11:27:32 2019) [sssd[be[ipa.domain]]] [be_resolve_server_process] 
(0x1000): Saving the first resolved server
(Thu Oct 10 11:27:32 2019) [sssd[be[ipa.domain]]] [be_resolve_server_process] 
(0x0200): Found address for server a08238.ad.domain.root: [10.121.129.9] TTL 
1236
(Thu Oct 10 11:27:32 2019) [sssd[be[ipa.domain]]] [sssd_async_socket_init_send] 
(0x4000): Using file descriptor [29] for the connection.
(Thu Oct 10 11:27:32 2019) [sssd[be[ipa.domain]]] [sssd_async_socket_init_send] 
(0x0400): Setting 6 seconds timeout for connecting
(Thu Oct 10 11:27:32 2019) [sssd[be[ipa.domain]]] [sdap_process_result] 
(0x2000): Trace: sh[0x558da736b2f0], connected[1], ops[(nil)], 
ldap[0x558da7367cb0]
(Thu Oct 10 11:27:32 2019) [sssd[be[ipa.domain]]] [sdap_process_result] 
(0x2000): Trace: end of ldap_result list

Could you please help me on this? Thanks in advance!
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