Wireguard Handshake failures

[Venkatakrishna S]

I came across a weird problem when I connect and disconnect
continuously. The handshakes are failing and the wireguard(server) is
generating and destroying key pairs continuously for the client. I
have added the wireguard logs ,client and server configuration below.
Checked the iptable input rules for the client , those are correct.
But the wireguard traffic is blocked. Tried with persistent-keepalive
enabled and disabled. The same conf below works if I do not connect
and disconnect continuously within a short span of time. It starts
working after I stop the wireguard on my client and remove the peer on
the server. Need help as I'm unable to figure out the root cause.
Thanks in advance!

Server conf :
# interface_server start Created by wrapper @ 2022-12-28
17:02:22.645524175 +0000 UTC
[Interface]
Address = 10.0.0.48/26
ListenPort = 443
PrivateKey = <privateKey>
PostUp = sysctl -w net.ipv4.ip_forward=1; iptables -t nat -A
POSTROUTING -o eth0 -j MASQUERADE;
PostDown = iptables -t nat -D POSTROUTING -o eth0 -j MASQUERADE;
SaveConfig = false
# interface_server end


Client conf :

 PrivateKey = <privatekey>
 Address = 10.0.0.41/32
 DNS = 8.8.8.8, 8.8.4.4
 [Peer]
 PublicKey = <public key>
 AllowedIPs = <ip1>, <ip2>  , <ip3> ,   8.8.8.8/32, 8.8.4.4/32
 Endpoint = endpointip:443


Server Wireguard logs :

[Wed Jan 11 11:42:21 2023] wireguard: wg0: Sending handshake response
to peer 247 (ip:port)
[Wed Jan 11 11:42:21 2023] wireguard: wg0: Keypair 12666 destroyed for peer 247
[Wed Jan 11 11:42:21 2023] wireguard: wg0: Keypair 12667 created for peer 247
[Wed Jan 11 11:42:26 2023] wireguard: wg0: Receiving handshake
initiation from peer 247 (ip:port)
[Wed Jan 11 11:42:26 2023] wireguard: wg0: Sending handshake response
to peer 247 (ip:port)
[Wed Jan 11 11:42:26 2023] wireguard: wg0: Keypair 12667 destroyed for peer 247
[Wed Jan 11 11:42:26 2023] wireguard: wg0: Keypair 12668 created for peer 247
[Wed Jan 11 11:42:31 2023] wireguard: wg0: Receiving handshake
initiation from peer 247 (ip:port)
[Wed Jan 11 11:42:31 2023] wireguard: wg0: Sending handshake response
to peer 247 (ip:port)
[Wed Jan 11 11:42:31 2023] wireguard: wg0: Keypair 12668 destroyed for peer 247
[Wed Jan 11 11:42:31 2023] wireguard: wg0: Keypair 12669 created for peer 247
[Wed Jan 11 11:42:36 2023] wireguard: wg0: Receiving handshake
initiation from peer 247 (ip:port)
[Wed Jan 11 11:42:36 2023] wireguard: wg0: Sending handshake response
to peer 247 (ip:port)
[Wed Jan 11 11:42:36 2023] wireguard: wg0: Keypair 12669 destroyed for peer 247
[Wed Jan 11 11:42:36 2023] wireguard: wg0: Keypair 12670 created for peer 247
[Wed Jan 11 11:42:41 2023] wireguard: wg0: Receiving handshake
initiation from peer 247 (ip:port)
[Wed Jan 11 11:42:41 2023] wireguard: wg0: Sending handshake response
to peer 247 (ip:port)
[Wed Jan 11 11:42:41 2023] wireguard: wg0: Keypair 12670 destroyed for peer 247
[Wed Jan 11 11:42:41 2023] wireguard: wg0: Keypair 12671 created for peer 247
[Wed Jan 11 11:42:46 2023] wireguard: wg0: Receiving handshake
initiation from peer 247 (ip:port)
[Wed Jan 11 11:42:46 2023] wireguard: wg0: Sending handshake response
to peer 247 (ip:port)
[Wed Jan 11 11:42:46 2023] wireguard: wg0: Keypair 12671 destroyed for peer 247
[Wed Jan 11 11:42:46 2023] wireguard: wg0: Keypair 12672 created for peer 247
[Wed Jan 11 11:42:51 2023] wireguard: wg0: Receiving handshake
initiation from peer 247 (ip:port)
[Wed Jan 11 11:42:51 2023] wireguard: wg0: Sending handshake response
to peer 247 (ip:port)
[Wed Jan 11 11:42:51 2023] wireguard: wg0: Keypair 12672 destroyed for peer 247
[Wed Jan 11 11:42:51 2023] wireguard: wg0: Keypair 12673 created for peer 247


Client Logs :

2023-01-11 17:10:28.493: [TUN] [ZTNATunnelService] Sending handshake
initiation to peer 7 (endpoint:port)
2023-01-11 17:10:33.601: [TUN] [ZTNATunnelService] Handshake for peer
7 (endpoint:port) did not complete after 5 seconds, retrying (try 2)
2023-01-11 17:10:33.601: [TUN] [ZTNATunnelService] Sending handshake
initiation to peer 7 (endpoint:port)
2023-01-11 17:10:38.616: [TUN] [ZTNATunnelService] Handshake for peer
7 (endpoint:port) did not complete after 5 seconds, retrying (try 2)
2023-01-11 17:10:38.616: [TUN] [ZTNATunnelService] Sending handshake
initiation to peer 7 (endpoint:port)
2023-01-11 17:10:43.637: [TUN] [ZTNATunnelService] Handshake for peer
7 (endpoint:port) did not complete after 5 seconds, retrying (try 2)
2023-01-11 17:10:43.637: [TUN] [ZTNATunnelService] Sending handshake
initiation to peer 7 (endpoint:port)
2023-01-11 17:10:48.699: [TUN] [ZTNATunnelService] Handshake for peer
7 (endpoint:port) did not complete after 5 seconds, retrying (try 2)
2023-01-11 17:10:48.699: [TUN] [ZTNATunnelService] Sending handshake
initiation to peer 7 (endpoint:port)
2023-01-11 17:10:53.781: [TUN] [ZTNATunnelService] Handshake for peer
7 (endpoint:port) did not complete after 5 seconds, retrying (try 2)
2023-01-11 17:10:53.781: [TUN] [ZTNATunnelService] Sending handshake
initiation to peer 7 (endpoint:port)
2023-01-11 17:10:58.835: [TUN] [ZTNATunnelService] Handshake for peer
7 (endpoint:port) did not complete after 5 seconds, retrying (try 2)
2023-01-11 17:10:58.835: [TUN] [ZTNATunnelService] Sending handshake
initiation to peer 7 (endpoint:port)
2023-01-11 17:11:03.922: [TUN] [ZTNATunnelService] Handshake for peer
7 (endpoint:port) did not complete after 5 seconds, retrying (try 2)
2023-01-11 17:11:03.922: [TUN] [ZTNATunnelService] Sending handshake
initiation to peer 7 (endpoint:port)
2023-01-11 17:11:08.968: [TUN] [ZTNATunnelService] Handshake for peer
7 (endpoint:port) did not complete after 5 seconds, retrying (try 2)
2023-01-11 17:11:08.968: [TUN] [ZTNATunnelService] Sending handshake
initiation to peer 7 (endpoint:port)
2023-01-11 17:11:14.079: [TUN] [ZTNATunnelService] Handshake for peer
7 (endpoint:port) did not complete after 5 seconds, retrying (try 2)
2023-01-11 17:11:14.079: [TUN] [ZTNATunnelService] Sending handshake
initiation to peer 7 (endpoint:port)
2023-01-11 17:11:19.183: [TUN] [ZTNATunnelService] Handshake for peer
7 (endpoint:port) did not complete after 5 seconds, retrying (try 2)
2023-01-11 17:11:19.183: [TUN] [ZTNATunnelService] Sending handshake
initiation to peer 7 (endpoint:port)
2023-01-11 17:11:24.196: [TUN] [ZTNATunnelService] Handshake for peer
7 (endpoint:port) did not complete after 5 seconds, retrying (try 2)
2023-01-11 17:11:24.196: [TUN] [ZTNATunnelService] Sending handshake
initiation to peer 7 (endpoint:port)
2023-01-11 17:11:29.345: [TUN] [ZTNATunnelService] Handshake for peer
7 (endpoint:port) did not complete after 5 seconds, retrying (try 2)
2023-01-11 17:11:29.345: [TUN] [ZTNATunnelService] Sending handshake
initiation to peer 7 (endpoint:port)
2023-01-11 17:11:34.360: [TUN] [ZTNATunnelService] Sending handshake
initiation to peer 7 (endpoint:port)
2023-01-11 17:11:39.376: [TUN] [ZTNATunnelService] Handshake for peer
7 (endpoint:port) did not complete after 5 seconds, retrying (try 2)
2023-01-11 17:11:39.376: [TUN] [ZTNATunnelService] Sending handshake
initiation to peer 7 (endpoint:port)
2023-01-11 17:11:44.537: [TUN] [ZTNATunnelService] Handshake for peer
7 (endpoint:port) did not complete after 5 seconds, retrying (try 2)
2023-01-11 17:11:44.537: [TUN] [ZTNATunnelService] Sending handshake
initiation to peer 7 (endpoint:port)