This is a follow-up of my post Fritz!Box VPN error messages.
I had been failing to get a LAN-LAN connection between two xs4all Fritz!Box internet connections working, despite the description in [WayBack] Adapting a VPN connection from FRITZ!Box to FRITZ!Box (LAN-LAN) | AVM International.
I was keeping the 0x1C error, and eventually contacted the customer support. At first they redirected me again to the documentation, so I replied with detailed PDFs for both Fritz!Box devices containing detailed information about:
- both their internet connectivity
- both their internal network settings
- both their error logs
- both their VPN configuration (including LAN-LAN and personal entries)
I got a reply back that – paraphrased – went like “We cannot provide network-administration-support, but VPN support of Fritz!Box in general works fine, so please read these pages”:
Given that they knew both connections were xs4all (which out-of-the-box doesn’t firewall), the PDFs didn’t indicate any firewall configuration and support not asking if the individual VPN connections worked (they do) but just blaming me or the Firewall is blatant, especially since they did not explain what the error codes meant.
Besides I already had read those pages and tried all the suggested solutions (more than a day work, as there are many suggested steps, Fritz!Box devices tend to reboot on many configuration change types and their DSL training is slow at best).
After the email, I went back to the drawing board based in this one twitter conversation that was partially useful (but failed to indicate more error codes and also pointed me to their email helpdesk which failed miserably).
The IKE-error 0x1C can mean that the remote IP doesn’t match the expected IP.
So I tried this:
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