As last resort we've change ipaddr of this host, and mon successfully joined to quorum. When revert ipaddr back - mon can't join, we think there something on switch side or on old mon's side. From old mon's I was checked new mon process connectivity via telnet - all works It's good to make a some reproducer of this network problem to know what exactly message of ceph protocol is broken k _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx