VPN through opnsense does not receive any data

[ian.bugeja]

I have a pretty standard setup with NAT and IPV4. We have a client PC connecting to a checkpoint VPN (IPSEC) through the opnsense firewall. (this is not the opnsense VPN just a normal connection from the firewall's end) For some reason the connection succeeds but the VPN client receives no data hence the connection then drops after a couple of seconds.

Any pointers where I can look please? I tried looking at the logs but cannot see any packets coming from the source.

[benyamin]

It's been some time since i played with IPSec with NAT-T, but IIRC, you will have some trouble during Phase 1 setup of the tunnel if the identifiers are not correctly set.

You may also need to ensure that opnsense is not listening for IPSec connections as it will "steal" the connection "returning" from the CheckPoint device to your PC (or vice versa, as the case might be depending on what you meant by "client").

HTH,
Ben