mobile client have no internet when connected to Wireguard server on VPS

[milad86]

Hello,

the problem that I have with this script is that although clients connect to the server , no internet is available though. I asked my VPS support team to verify the UDP ports state. they insist that they are not blocking anything. If I allow a UDP port via UFW, it means it is fully open/useable.

How May I troubleshoot ?, how to fix this issue ? Im not a networking pro, but I can manage to understand subjects..

and Here is my current wg0.conf file

[Interface]
PrivateKey = IGRiR6f8QNn9yDX5Zw6Ej7bzHN3id46OYAaAnq5LzUk=
Address = 10.18.0.1/24
ListenPort = 51820
SaveConfig = false

PostUp = ufw route allow in on wg0 out on eth0
PostUp = iptables -t nat -I POSTROUTING -o eth0 -j MASQUERADE
PreDown = ufw route delete allow in on wg0 out on eth0
PreDown = iptables -t nat -D POSTROUTING -o eth0 -j MASQUERADE

[Peer]

ez1

PublicKey = vU3czqnhgbbh1vZaK/OtBd2iG6D0oLoNybVnX+Q1qnU=
AllowedIPs = 10.18.0.2

and this is my UFW status : (( note: I also tried with disabling UFW but didnt help))

Status: active

To Action From

---

22/tcp ALLOW Anywhere
2222/tcp ALLOW Anywhere
2323/tcp ALLOW Anywhere
53747/udp ALLOW Anywhere
53747/tcp ALLOW Anywhere
53747 ALLOW Anywhere
443 ALLOW Anywhere
943 ALLOW Anywhere
1194 ALLOW Anywhere
1194/udp ALLOW Anywhere
22 ALLOW Anywhere
51820/udp ALLOW Anywhere
22/tcp (v6) ALLOW Anywhere (v6)
2222/tcp (v6) ALLOW Anywhere (v6)
2323/tcp (v6) ALLOW Anywhere (v6)
53747/udp (v6) ALLOW Anywhere (v6)
53747/tcp (v6) ALLOW Anywhere (v6)
53747 (v6) ALLOW Anywhere (v6)
443 (v6) ALLOW Anywhere (v6)
943 (v6) ALLOW Anywhere (v6)
1194 (v6) ALLOW Anywhere (v6)
1194/udp (v6) ALLOW Anywhere (v6)
22 (v6) ALLOW Anywhere (v6)
51820/udp (v6) ALLOW Anywhere (v6)

here is tcpdump -nn -i eth0 udp and port 51820 report when I connect a client.

sudo tcpdump -nn -i eth0 udp and port 51820
tcpdump: verbose output suppressed, use -v[v]... for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), snapshot length 262144 bytes
11:11:51.994131 IP 86.55.14.12.61855 > 149.50.209.143.51820: UDP, length 148
11:11:51.996464 IP 149.50.209.143.51820 > 86.55.14.12.61855: UDP, length 92

at all times,with all configs, on client I see Data sent 1KB, NO Data Received at all, NO Handshake