[Dovecot] Interrupted system call in imap-login

[Giovanni Mancuso]

 Hi,

We have some problems with dovecot 1.2.11 that we can't resolve yet
The problem is that we have in maillog:
      imap-login: Error: Can't connect to auth server at default:
Interrupted
system call

The operating system is Solaris 9, and sometimes dovecot works fine.
Dovecot is configured to use ldap.
The dovecot -n :

log_path: /var/log/maillog
info_log_path: /var/log/maillog
log_timestamp: %Y-%m-%d %H:%M:%S
protocols: imap pop3 imaps pop3s
listen(default): xxx.xxx.xxx.xxx:143
listen(imap): xxx.xxx.xxx.xxx:143
listen(pop3): xxx.xxx.xxx.xxx:110
ssl_listen(default): xxx.xxx.xxx.xxx:993
ssl_listen(imap): xxx.xxx.xxx.xxx:993
ssl_listen(pop3): xxx.xxx.xxx.xxx:995
ssl_cert_file: /opt/dovecot/certs/imapd.pem
ssl_key_file: /opt/dovecot/certs/imapd.pem
disable_plaintext_auth: no
login_dir: /opt/dovecot/var/run/dovecot/login
login_executable(default): /opt/dovecot/libexec/dovecot/imap-login
login_executable(imap): /opt/dovecot/libexec/dovecot/imap-login
login_executable(pop3): /opt/dovecot/libexec/dovecot/pop3-login
max_mail_processes: 1024
first_valid_uid: 102
first_valid_gid: 101
mail_uid: 102
mail_gid: 101
mail_location: maildir:%h/Maildir
mmap_disable: yes
dotlock_use_excl: no
mail_nfs_storage: yes
mail_nfs_index: yes
lock_method: dotlock
mbox_write_locks: fcntl
mail_drop_priv_before_exec: yes
mail_executable(default): /opt/dovecot/libexec/dovecot/imap
mail_executable(imap): /opt/dovecot/libexec/dovecot/imap
mail_executable(pop3): /opt/dovecot/libexec/dovecot/pop3
mail_plugins(default): quota imap_quota
mail_plugins(imap): quota imap_quota
mail_plugins(pop3): quota
mail_plugin_dir(default): /opt/dovecot/lib/dovecot/imap
mail_plugin_dir(imap): /opt/dovecot/lib/dovecot/imap
mail_plugin_dir(pop3): /opt/dovecot/lib/dovecot/pop3
pop3_uidl_format(default): %08Xu%08Xv
pop3_uidl_format(imap): %08Xu%08Xv
pop3_uidl_format(pop3): UID%u-%v
namespace:
  type: private
  separator: .
  prefix: INBOX.
  inbox: yes
  list: yes
  subscriptions: yes
auth default:
  master_user_separator: *
  debug: yes
  worker_max_count: 50
  passdb:
    driver: passwd-file
    args: /opt/dovecot/etc/passwd.masterusers
    master: yes
  passdb:
    driver: ldap
    args: /opt/dovecot/etc/dovecot-ldap.conf
  userdb:
    driver: ldap
    args: /opt/dovecot/etc/dovecot-ldap.conf
plugin:
  quota: maildir
  quota_rule2: Trash:storage=100M

I try to chage nsswitch.conf, I see the ldap logs, ecc...
But I don't find anything

I really don't know what to do now, can you help us please?

I tried to update dovecot with 1.2.17 version, but the problem is the same.

Thanks