I tried wg syncconf wg0 <(wg-quick strip wg0) without success. Only restarting wireguard by systemctl restart wg-quick@wg0 makes it respond with a Handshake Response packet.
This happens really rarely and especially on OpenWrt 19.07 as a client. Other clients can handshake properly while the server fails to complete the handshake for the OpenWrt device. Packet Captures on boths sides are in the attachments. Server: 5.9.0-0.bpo.5-amd64 #1 SMP Debian 5.9.15-1~bpo10+1 (2020-12-31) x86_64 GNU/Linux wireguard-tools v1.0.20210223 - https://git.zx2c4.com/wireguard-tools/ wireguard-dkms/buster-backports,now 1.0.20210219-1~bpo10+1 Client: 4.14.221 #0 SMP Mon Feb 15 15:22:37 2021 armv7l GNU/Linux wireguard-tools v1.0.20191226 - https://git.zx2c4.com/wireguard-tools/ kmod-wireguard 4.14.221+1.0.20200611-2 Arınç Ü.
server.pcapng
Description: Binary data
client.pcapng
Description: Binary data
