https://community.checkpoint.com/t5/Firewall-and-Security-Management/VPN-Site-to-Site-do-not-Up-the-tunnel/m-p/76575#M11509 <P>If you just see "no response from peer" messages in the logs when investigating traffic between both vpn peers, let the peer gateway admin investigate hos logs.</P> Thu, 27 Feb 2020 12:23:13 GMT Vincent_Bacher 2020-02-27T12:23:13Z https://community.checkpoint.com/t5/Firewall-and-Security-Management/VPN-Site-to-Site-do-not-Up-the-tunnel/m-p/76502#M11507 <P>Hello,</P><P>Please your help how to troubleshoot a Site to Site VPN after setting all the parameters, it does not Up any Phase.</P><P>&nbsp;</P><P>Thanks</P><P>&nbsp;</P><P>BR.</P><P>LRS</P> Wed, 26 Feb 2020 21:01:44 GMT https://community.checkpoint.com/t5/Firewall-and-Security-Management/VPN-Site-to-Site-do-not-Up-the-tunnel/m-p/76502#M11507 Lenin_Ramirez 2020-02-26T21:01:44Z https://community.checkpoint.com/t5/Firewall-and-Security-Management/VPN-Site-to-Site-do-not-Up-the-tunnel/m-p/76571#M11508 try to look at this sk34467.<BR />1. You have to send interesting traffc in order to GO-UP state in IPSec<BR />2. Capture UDP 500 with tcpdump if anything is coming to your peer Thu, 27 Feb 2020 12:14:11 GMT https://community.checkpoint.com/t5/Firewall-and-Security-Management/VPN-Site-to-Site-do-not-Up-the-tunnel/m-p/76571#M11508 Martin_Raska 2020-02-27T12:14:11Z https://community.checkpoint.com/t5/Firewall-and-Security-Management/VPN-Site-to-Site-do-not-Up-the-tunnel/m-p/76575#M11509 <P>If you just see "no response from peer" messages in the logs when investigating traffic between both vpn peers, let the peer gateway admin investigate hos logs.</P> Thu, 27 Feb 2020 12:23:13 GMT https://community.checkpoint.com/t5/Firewall-and-Security-Management/VPN-Site-to-Site-do-not-Up-the-tunnel/m-p/76575#M11509 Vincent_Bacher 2020-02-27T12:23:13Z