Dear Gergely and everybody, When I call from UAC1 register in Auth_SER to UAC2 register in Verifer_SER i got follow error: WARNING: no fork mode 0(6759) init_tcp: using epoll_lt as the io watch method (auto detected) 0(6759) Maxfwd module- initializing 0(6759) AUTH_IDENTITY:mod_init: Private key path is missing! Authorization service is disabled 0(6759) INFO: udp_init: SO_RCVBUF is initially 107520 0(6759) INFO: udp_init: SO_RCVBUF is finally 262142 0(6759) BUG: mysql: db_init: called from the main process, ignoring... 0(6759) BUG: mysql: db_init: called from the main process, ignoring... 0(6759) BUG: mysql: db_init: called from the main process, ignoring... 0(6759) BUG: mysql: db_init: called from the main process, ignoring... 0(6759) ERROR: t_reply: cannot send a t_reply to a message for which no T-state has been established 0(6759) ERROR: t_reply: cannot send a t_reply to a message for which no T-state has been established What is T-state, how can i this problem solve? Thank for response. Tuan.