i resolved.

Have a fail in the host file

It is good to hear you were able to resolve this issue.

Usually the starting point to investigate, is to look at the communication between the primary and secondary servers.

Please refer to the online document link : 

https://dbvisit.atlassian.net/wiki/display/DS8QSG/Dbvisit+Standby+Networking+-+Dbvnet#DbvisitStandbyNetworking-Dbvnet-7.TroubleshootingDbvnet

Some pointers are :

1. check the c:\Windows\System32\Drivers\etc\hosts on both primary and standby servers.

2. run the netstat command on both primary and standby servers.

3. run the System Readiness test  - C:\Program Files\Dbvisit\Standby>dbvctl.exe -f system_readiness