Hello,
I have a similar problem after upgrading to Debian 12. On all upgraded machines 
sssd-pac.service fails. My understanding is, that services listed in the 
services line are not socket activated. Therefore I completely removed this 
line in Debian 11. Since Debian preconfigured the socket services I would then 
still have failed services when I would add them to services=. 
This is my sssd.conf (domain names removed):

[sssd]
domains = xxxx
config_file_version = 2

[domain/xxxx]
default_shell = /bin/bash
krb5_store_password_if_offline = True
cache_credentials = True
krb5_realm = XXXX
realmd_tags = manages-system joined-with-adcli
id_provider = ad
fallback_homedir = /home/%u@%d
ad_domain = xxxx
use_fully_qualified_names = True
ldap_id_mapping = True
access_provider = ad
ldap_user_ssh_public_key = altSecurityIdentities
ad_gpo_access_control = disabled

[pam]

[pac]

[ssh]

[sudo]

[nss]
default_shell = /bin/bash
shell_fallback = /bin/bash
allowed_shells = /bin/bash,/bin/zsh


I can see the same errors as described above in my log file. "sudo systemctl | 
grep sssd" provides the following output:

  sssd-nss.service                                                              
                   loaded active running   SSSD NSS Service responder
● sssd-pac.service                                                              
                   loaded failed failed    SSSD PAC Service responder
  sssd-pam.service                                                              
                   loaded active running   SSSD PAM Service responder
  sssd-ssh.service                                                              
                   loaded active running   SSSD SSH Service responder
  sssd.service                                                                  
                   loaded active running   System Security Services Daemon
  sssd-autofs.socket                                                            
                   loaded active listening SSSD AutoFS Service responder socket
  sssd-nss.socket                                                               
                   loaded active running   SSSD NSS Service responder socket
● sssd-pac.socket                                                               
                   loaded failed failed    SSSD PAC Service responder socket
  sssd-pam-priv.socket                                                          
                   loaded active running   SSSD PAM Service responder private 
socket
  sssd-pam.socket                                                               
                   loaded active running   SSSD PAM Service responder socket
  sssd-ssh.socket                                                               
                   loaded active running   SSSD SSH Service responder socket
  sssd-sudo.socket                                                              
                   loaded active listening SSSD Sudo Service responder socket

It seems that sssd-pac is still started with the main sssd process:
"sudo systemctl status sssd.service":
● sssd.service - System Security Services Daemon
     Loaded: loaded (/lib/systemd/system/sssd.service; enabled; preset: enabled)
     Active: active (running) since Mon 2023-08-07 12:56:45 CEST; 50min ago
   Main PID: 14410 (sssd)
      Tasks: 3 (limit: 9481)
     Memory: 19.8M
        CPU: 1.938s
     CGroup: /system.slice/sssd.service
             ├─14410 /usr/sbin/sssd -i --logger=files
             ├─14411 /usr/libexec/sssd/sssd_be --domain xxxx --uid 0 --gid 0 
--logger=files
             └─14412 /usr/libexec/sssd/sssd_pac --uid 0 --gid 0 --logger=files

Aug 07 12:56:44 yyyy systemd[1]: Starting sssd.service - System Security 
Services Daemon...
Aug 07 12:56:45 yyyy sssd[14410]: Starting up
Aug 07 12:56:45 yyyy sssd_be[14411]: Starting up
Aug 07 12:56:45 yyyy sssd_pac[14412]: Starting up
Aug 07 12:56:45 yyyy systemd[1]: Started sssd.service - System Security 
Services Daemon.

On Debian 11 I do net see /usr/libexec/sssd/sssd_pac as part of this output.

Does anybody have an idea on how to fix this?

Regards
Steven
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