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we have Kerio MailServer 6.7.1 installed on a Ubuntu 8.04 x86_64 system which works quite fine. We use ldap authentication via unix PAM and even that is working as desired but the ugly problem is, it raises an error on every login in /var/log/auth.log as follows:

Sep 11 16:39:40 keydev1 mailserver: PAM unable to dlopen(/lib/security/
Sep 11 16:39:40 keydev1 mailserver: PAM [error: /lib/security/ wrong ELF class: ELFCLASS64]
Sep 11 16:39:40 keydev1 mailserver: PAM adding faulty module: /lib/security/

The PAM config file in /etc/pam.d/keriomail is:

#auth       required    /lib32/security/
#account    required    /lib32/security/
#password   required    /lib32/security/ nullok md5 shadow

auth       required   /lib32/security/
account    required   /lib32/security/
password   required   /lib32/security/

Does anybody know why PAM still searches for the module and why it uses its 64bit-version? How can I avoid this.

Many thanks in advance!
Pavel Dobry (Kerio)

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You need to install the PAM modules correctly and change the keriomail PAM module if running on 64-bit system. Read

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Thanks for your answer. But I installed everything exactly as described in that KB article (as you can see, the paths are pointing to a lib32 directory). It is currently working. But there are still the error messages in auth.log for every(!) login.

I'd like to use the LDAP directory exclusively and so I have no other module in the keriomail PAM config. So I'm wondering why there are errors telling me, the mailserver wants to load the 64bit module from /lib/security/ Is there any additional configuration I need to change to use 32bit modules?

BTW: I tested PAM auth with normal as it came with the example configuration

auth       required    /lib32/security/
account    required    /lib32/security/
password   required    /lib32/security/ nullok md5 shadow

and it works but there are the same errors on every login. So it seems to be no LDAP related problem but a more general PAM/64bit problem.
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