i am getting this error

postfix/smtpd[20629]: warning: SASL authentication failure: cannot connect to saslauthd server: No such file or directory
probably better explained by :

testsaslauthd -u cyrus -p cyrus
0: NO "authentication failed"
with LOGMESSAGE:
Mar 16 16:41:01 h1441418 saslauthd[7091]: PAM unable to dlopen(/lib/security/pam_pwdb.so): /lib/security/pam_pwdb.so: cannot open shared object file: No such file or directory
this is probably because /lib/security/pam_pwdb.so does not exist but /lib64/security/pam_unix.so does

does anybody know which file should I create or edit (in /etc/pam.d ?) to fix the path for saslauthd / pam when trying to set up a TSL secure smtp connection?

tnx. in advance