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WireGuard VPN client does not work behind FritzBox!Gastzugang. Does FritzBox!Gastzugang ship with a UDP filter?

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While staying with some older relatives in Germany, I discovered my Wireguard client could not complete its handshake with a Wireguard server I'd stood up.

I thought the problem was likely me and my Terraform script, so I spent a little time checking the configs, logs, etc. I couldn't find anything out of the ordinary. I then figured I could determine whether or not the issue was on my end by trying to connect to a NordVPN server. That also didn't work. So, I switched from the guest network to the main network. Lo, and behold it all worked.

For closure on this little VPN quest, I'm curious if anyone knows whether FritzBox routers ship with a configuration that would cause this behavior. I was thinking something like a UDP filter would fit the bill.

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