"pam_unix(lightdm:auth): conversation failed" on first login attempt
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
Light Display Manager |
New
|
Undecided
|
Unassigned |
Bug Description
Dear maintainers,
I have set up Xubuntu 14.04 computers in a Active Directory environnement, using sssd. Everything is working well, except sometimes authentication with lightdm:
Here are the messages I have in /var/log/auth.log :
Mar 5 09:12:12 profs-04u lightdm: pam_succeed_
Mar 5 09:12:12 profs-04u lightdm: pam_unix(
Mar 5 09:12:12 profs-04u lightdm: pam_unix(
Mar 5 09:12:12 profs-04u lightdm: pam_sss(
Mar 5 09:12:12 profs-04u lightdm: pam_sss(
Mar 5 09:12:12 profs-04u lightdm: PAM unable to dlopen(
Mar 5 09:12:12 profs-04u lightdm: PAM adding faulty module: pam_kwallet.so
Mar 5 09:12:12 profs-04u lightdm: pam_succeed_
Mar 5 09:13:04 profs-04u lightdm: pam_unix(
Mar 5 09:13:06 profs-04u lightdm: pam_sss(
Mar 5 09:13:06 profs-04u lightdm: pam_unix(
Mar 5 09:13:07 profs-04u lightdm: pam_unix(
As you can see here, the first attempt fails because of "pam_unix(
Indeed, if the first login fails, the second one will always work. I also never had this problem if someone already authenticated on the computer.
The problem appears randomly:
- it appears sometimes if I try to login just after boot, and also sometimes if I wait two hours after boot.
- if I boot many computers in the same time (all configured the same way), and then try to authenticate on these with the same login, it will succeed on some and fail on others
I know this problem can come from many another components and configurations (network, sssd, kerberos,...), but I reported this bug against lightdm because it is the only place I found a significative error message. If you could tell me what "pam_unix(
Also, do not hesitate to ask for more informations.
Thanks,
Yvan