More logs. This is from another broken client during an attempt to login as an AD user:
****
(Fri Feb 12 16:35:20 2021) [sssd[be[ipa.domain.edu]]] [sss_domain_get_state] (0x1000):
Domain
domain.edu is Active
(Fri Feb 12 16:35:20 2021) [sssd[be[ipa.domain.edu]]] [sdap_id_op_connect_step] (0x4000):
reusing cached connection
(Fri Feb 12 16:35:20 2021) [sssd[be[ipa.domain.edu]]] [ipa_s2n_get_acct_info_send]
(0x0400): Sending request_type: [REQ_FULL_WITH_MEMBERS] for trust user
[S-1-5-21-71189414-1642862984-1097818727-22197] to IPA server
(Fri Feb 12 16:35:20 2021) [sssd[be[ipa.domain.edu]]] [ipa_s2n_exop_send] (0x0400):
Executing extended operation
(Fri Feb 12 16:35:20 2021) [sssd[be[ipa.domain.edu]]] [ipa_s2n_exop_send] (0x2000):
ldap_extended_operation sent, msgid = 16
(Fri Feb 12 16:35:20 2021) [sssd[be[ipa.domain.edu]]] [sdap_op_add] (0x2000): New
operation 16 timeout 6
(Fri Feb 12 16:35:20 2021) [sssd[be[ipa.domain.edu]]] [sdap_process_result] (0x2000):
Trace: sh[0x55eb482586a0], connected[1], ops[0x55eb482c6f10], ldap[0x55eb48274a50]
(Fri Feb 12 16:35:20 2021) [sssd[be[ipa.domain.edu]]] [sdap_process_result] (0x2000):
Trace: end of ldap_result list
(Fri Feb 12 16:35:20 2021) [sssd[be[ipa.domain.edu]]] [sdap_process_result] (0x2000):
Trace: sh[0x55eb482586a0], connected[1], ops[0x55eb482c6f10], ldap[0x55eb48274a50]
(Fri Feb 12 16:35:20 2021) [sssd[be[ipa.domain.edu]]] [sdap_process_message] (0x4000):
Message type: [LDAP_RES_EXTENDED]
(Fri Feb 12 16:35:20 2021) [sssd[be[ipa.domain.edu]]] [ipa_s2n_exop_done] (0x0040):
ldap_extended_operation result: Operations error(1), Failed to split fully qualified
name.
(Fri Feb 12 16:35:20 2021) [sssd[be[ipa.domain.edu]]] [ipa_s2n_exop_done] (0x0040):
ldap_extended_operation failed, server logs might contain more details.
(Fri Feb 12 16:35:20 2021) [sssd[be[ipa.domain.edu]]] [sdap_op_destructor] (0x2000):
Operation 16 finished
(Fri Feb 12 16:35:20 2021) [sssd[be[ipa.domain.edu]]] [ipa_s2n_get_user_done] (0x0040):
s2n exop request failed.
(Fri Feb 12 16:35:20 2021) [sssd[be[ipa.domain.edu]]] [sdap_id_op_done] (0x4000):
releasing operation connection
(Fri Feb 12 16:35:20 2021) [sssd[be[ipa.domain.edu]]] [ipa_subdomain_account_done]
(0x0040): ipa_get_*_acct request failed: [1432158229]: Network I/O Error.
(Fri Feb 12 16:35:20 2021) [sssd[be[ipa.domain.edu]]] [sdap_id_op_destroy] (0x4000):
releasing operation connection
(Fri Feb 12 16:35:20 2021) [sssd[be[ipa.domain.edu]]] [dp_req_done] (0x0400): DP Request
[Account #1]: Request handler finished [0]: Success
(Fri Feb 12 16:35:20 2021) [sssd[be[ipa.domain.edu]]] [_dp_req_recv] (0x0400): DP Request
[Account #1]: Receiving request data.
(Fri Feb 12 16:35:20 2021) [sssd[be[ipa.domain.edu]]] [dp_req_reply_list_success]
(0x0400): DP Request [Account #1]: Finished. Success.
(Fri Feb 12 16:35:20 2021) [sssd[be[ipa.domain.edu]]] [dp_req_reply_std] (0x1000): DP
Request [Account #1]: Returning [Internal Error]: 3,1432158229,Network I/O Error
(Fri Feb 12 16:35:20 2021) [sssd[be[ipa.domain.edu]]] [dp_table_value_destructor]
(0x0400): Removing [0:1:0x0001:1:V:domain.edu:name=connerms@domain.edu] from reply table
(Fri Feb 12 16:35:20 2021) [sssd[be[ipa.domain.edu]]] [dp_req_destructor] (0x0400): DP
Request [Account #1]: Request removed.
(Fri Feb 12 16:35:20 2021) [sssd[be[ipa.domain.edu]]] [dp_req_destructor] (0x0400): Number
of active DP request: 0
(Fri Feb 12 16:35:20 2021) [sssd[be[ipa.domain.edu]]] [sdap_process_result] (0x2000):
Trace: sh[0x55eb482586a0], connected[1], ops[(nil)], ldap[0x55eb48274a50]
(Fri Feb 12 16:35:20 2021) [sssd[be[ipa.domain.edu]]] [sdap_process_result] (0x2000):
Trace: end of ldap_result list
(Fri Feb 12 16:35:20 2021) [sssd[be[ipa.domain.edu]]] [sbus_dispatch] (0x4000): dbus conn:
0x55eb482d0940
(Fri Feb 12 16:35:20 2021) [sssd[be[ipa.domain.edu]]] [sbus_dispatch] (0x4000):
Dispatching.
(Fri Feb 12 16:35:20 2021) [sssd[be[ipa.domain.edu]]] [sbus_message_handler] (0x2000):
Received SBUS method org.freedesktop.sssd.dataprovider.getAccountInfo on path
/org/freedesktop/sssd/dataprovider
****
The `Returning [Internal Error]: 3,1432158229,Network I/O Error` part sticks out.