Wireguard client under Windows fails handshake, while Android works

[louis_nichols]

Hi,

I configured Wireguard in my OPNSense following these instructions:

https://docs.opnsense.org/manual/how-tos/wireguard-client.html

using IPv4 only. For Normalization, I set 1372.

I defined two peers using the Peer Generator. I use one with my Android phone, and the second is for Windows. In Windows, I copy-pasted the config from the peer generator, so there is no reason to suspect keys or anything.

And now, the Android client works, but the Windows client keeps showing

2025-07-03 19:27:42.550: [TUN] [My_Wireguard] Handshake for peer 1 (<edited>:57394) did not complete after 5 seconds, retrying (try 2).

Under the transfer counters, the Rx stays always at 0.

I've read some posts online that suggested modifying the MTU in the Windows peer. I tried several values, but none of them had any effect.

I am adding screenshots with part of my config to this post. I am not able to add more because of attachment limits. I will try to add the rest to a reply to this post.

Any ideas?


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[louis_nichols]

I am adding more screenshots of my config.
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[louis_nichols]

And this is my Windows Config.

[zero4u]

Please try and remove the peer from the list on the wg interface. save, edit wg interface again and add the windows peer. save again. I do not know why but it worked for me.