Site 2 Site VPN open but but hosts not reachable

Hi Thierry MICHELS ,

Good day and thanks for reaching out to Sophos Community and hope you are well. 

What is the result on the end machine if you try to do a trace route? and also is ping the primary method of testing connectivity? If yes, please check if other ends allows to respond on ping or the machines on the other end and their software firewall allows connectivity? And also logs on SF and Zyxel

Also, kindly verify if the necessary details for S2S VPNs have been followed on both ends: https://support.sophos.com/support/s/article/KB-000035717?language=en_US

Thanks for your time and patience and thank you for choosing Sophos

Cheers,

Thank you for your Message.

I found it,
it was an error in the local LAN definition.