0006461: sssd suddenly stops to accept connections

For some reason sssd stops accepting connections. Status returns service is running but in secure log there're strings like<br /> sshd[6518]: pam_sss(sshd:session): Request to sssd failed. Connection refused<br /> <br /> Due to this host becomes unavailable to connect via ssh with ldap auth. Connecting as a local user and restarting sssd solves the problem but it appears randomly.