Hello everyone,
I’m experiencing an issue with the Checkpoint Mobile Client on two different devices (a virtual machine and a notebook), where there is no data flow over the VPN tunnel after the connection is successfully established. The connection is initiated but breaks shortly after because no data can be sent or received through the tunnel. Here are the details:
Device 1 (Virtual Machine):
Windows 11 24H2 is running in VirtualBox (Host: Windows 10). In NAT mode, the VPN tunnel works perfectly. However, when I switch the network adapter to Bridged mode so that the VM gets its own IP address from the Fritzbox router, the problem occurs. The tunnel is established, but no data flows through it, and shortly after, the connection drops with an error message stating that the gateway is not responding.
Device 2 (Notebook):
The same issue occurs here, regardless if WIFI or Ethernet (direct connection to the Fritzbox). After the connection is established, the VPN client sends keep-alive packets, but no response is received. Shortly after, the connection also drops.
Error Messages from the Checkpoint Mobile Client Log:
- No reply from the gw ip=11.11.11.11 for tunnel test packet. Office Mode IP=22.22.22.22
- IKE tunnel disconnected, error code=-1000. Reason: Site is not responding.
Steps I’ve Already Tried:
- Routing: Checked routes on both the VM and the notebook. No obvious issues. The default route correctly goes through the VPN.
- Firewall: Checked the Fritzbox firewall. IPsec passthrough is enabled. No blocked ports or protocols were found.
- MTU: Reduced the MTU value on both devices (down to 1300). No improvement.
- Alternative Networks: Tested the connection via a mobile hotspot – the VPN tunnel works perfectly in this case.
- DNS Settings: Tried different DNS servers (VPN-assigned and Google DNS). No improvement.
My Suspicion:
I suspect that the issue is either related to the Fritzbox configuration (routing or NAT) or the handling of the Office Mode IP by the Checkpoint Mobile Client.
Questions:
- Are there any known issues with the Checkpoint Mobile Client in combination with Fritzbox routers (e.g., Bridged mode or NAT)?
- What additional steps can I take to further diagnose or resolve the problem?
Thank you in advance for your support!
Note: I’m not very good at English, so I used ChatGPT to help me write this text.
