H3C Sec Path F1000-S

 leefullmetal SSH/4/fsm_move:FSM MOVE FROM SSH_Sub1_KEX_NewKey TO SSH_Sub1_Authentication 

 leefullmetal SSH/4/fsm_move:FSM MOVE FROM SSH_Sub2_Service_Acc TO SSH_Sub2_Auth_Init 

 leefullmetal SSH/4/user_not_exist:The user root doesn't exist 

 leefullmetal VTY/4/VTY_LOG: SSH user root failed to login from 151.230.233.168 on VTY0.

 leefullmetal SSH/4/err_disconnect:The connection is closed by SSH Server Current FSM is : SSH_Main_SSHProcess 

 leefullmetal SSH/4/fsm_move:FSM MOVE FROM SSH_Main_SSHProcess TO SSH_Main_Disconnect

leefullmetal SSH/4/fsm_move:FSM MOVE FROM SSH_Main_Connect TO SSH_Main_VersionMatch 

leefullmetal SSH/4/fsm_move:FSM MOVE FROM SSH_Main_VersionMatch TO SSH_Main_SSHProcess 

 leefullmetal SSH/4/fsm_move:FSM MOVE FROM SSH_Sub1_KEX_Init TO SSH_Sub1_KEX_GRP_Reply 

 leefullmetal SSH/4/fsm_move:FSM MOVE FROM SSH_Sub1_KEX_GRP_Reply TO SSH_Sub1_KEX_NewKey 

leefullmetal SSH/4/fsm_move:FSM MOVE FROM SSH_Main_Connect TO SSH_Main_VersionMatch 

 leefullmetal SSH/4/fsm_move:FSM MOVE FROM SSH_Main_VersionMatch TO SSH_Main_SSHProcess 

leefullmetal SSH/4/fsm_move:FSM MOVE FROM SSH_Sub1_KEX_NewKey TO SSH_Sub1_Authentication 

leefullmetal SSH/4/fsm_move:FSM MOVE FROM SSH_Sub2_Service_Acc TO SSH_Sub2_Auth_Init 

leefullmetal SSH/4/err_disconnect:The connection is closed by SSH Server Current FSM is : SSH_Main_SSHProcess 

leefullmetal SSH/4/fsm_move:FSM MOVE FROM SSH_Main_SSHProcess TO SSH_Main_Disconnect 

leefullmetal SSH/4/user_not_exist:The user root doesn't exist 

leefullmetal VTY/4/VTY_LOG: SSH user root failed to login from 151.230.233.168 on VTY0. 

leefullmetal SSH/4/err_disconnect:The connection is closed by SSH Server Current FSM is : SSH_Main_SSHProcess 

leefullmetal SSH/4/fsm_move:FSM MOVE FROM SSH_Main_SSHProcess TO SSH_Main_Disconnect 

leefullmetal SSH/4/fsm_move:FSM MOVE FROM SSH_Main_Connect TO SSH_Main_VersionMatch 

leefullmetal SSH/4/fsm_move:FSM MOVE FROM SSH_Main_VersionMatch TO SSH_Main_SSHProcess 

leefullmetal SSH/4/fsm_move:FSM MOVE FROM SSH_Sub1_KEX_Init TO SSH_Sub1_KEX_GRP_Reply 

leefullmetal SSH/4/fsm_move:FSM MOVE FROM SSH_Sub1_KEX_GRP_Reply TO SSH_Sub1_KEX_NewKey 

leefullmetal SSH/4/fsm_move:FSM MOVE FROM SSH_Sub1_KEX_NewKey TO SSH_Sub1_Authentication 

leefullmetal SSH/4/fsm_move:FSM MOVE FROM SSH_Sub2_Service_Acc TO SSH_Sub2_Auth_Init 

leefullmetal SSH/4/user_not_exist:The user root doesn't exist 

与分支机构建立了IPSecVPN，但每隔几天就会掉线，用户重启防火墙后就又恢复了连线。

查看logbuffer 发现上面的记录，大部分解释是SSH攻击造成的。 请问该如何处理这个掉线问题？ 感谢！