To people saying they have related bugs:
This bug is for the idmap working fine on initial login, but the mapping
being lost after the cache time is exceeded (with no other related
winbind activity like authentications/logins). The id mapping can be
seen (or seen as failed) using "ls" in a directory with files owned by
an active directory user (success shows names, failure shows numbers).
Preferably in a single comment please answer the following questions/steps:
0. Please file a separate bug if it's a separate issue.
1. If you find a configuration or specific set of versions that work, please
list all the differences.
2. Please try everything below with a fresh install of lucid on a separate
non-production system, if possible.
3. Please list the most recent package versions (e.g.: "dpkg -l|grep -i samba",
and maybe other packages. ubuntu-bug might help). It'd also be useful to list
your distribution even if it's clear from the version numbers, just to save
time looking it up.
4. Please list relevant configuration options (e.g. both winbind and idmap
sections of /etc/samba/smb.conf and maybe more. ubuntu-bug might post the
entire configuration file).
5. Check the log files for related information. /var/log/samba/log.winbind*
might be more useful than some of the other log files. Post anything that might
be relevant.
6. If using rid or ads as the backend, try to find out if you can still query
the domain controller with wbinfo -u and wbinfo -g. You may need to check
klist, net ads status, net ads info to see if your kerberos key didn't get
renewed. Some of this should be run under sudo with an Active Directory (AD)
authenticated user. Consider posting some of the output.
7. Try disabling the cache. Maybe try both "winbind cache time 0 " in smb.conf
and with the line missing if you're not sure which disables the cache. Post to
the bug the results of trying to get the mapping (e.g. by ls on a file owned by
an Active Directory mapped user).
8. Try "winbind offline logon = false" in smb.conf and post the results of
before and after cache timeout.
9. Post any information you can about the cache and mapping files. This could
be a tbl file. The log files might give some information about this.
10. List whether you did a fresh install of Ubuntu or an upgrade. If it was an
upgrade, what version(s) did you upgrade from?
11. Did you try any other idmap backends? If so, please list which ones and
what order. I believe there might be a bug on switching backends without
deleting a mapping file.
Thanks,
Drew Daniels
Resume: http://www.boxheap.net/ddaniels/resume.html
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winbind forgets uid/name gid/name mappings in regulary periods
https://bugs.launchpad.net/bugs/207791
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