Re: [Openvpn-users] OpenVPN tunnel stopped working (no traffic) after upgrade to OpenVPN 2.7 (Fedora 44)

Piotr Dobrogost <[email protected]>
Newsgroups gmane.network.openvpn.devel
Message-ID <CAA6tFMuzF31kpzB5j7pRTh6nC2RRSwBkTEiFLGu3XGOvYgb7mw@mail.gmail.com> 
On Fri, May 15, 2026 at 8:23 AM Gert Doering <[email protected]> wrote:
>
> What we need is a dump that shows the handshake, and the ports used,
> and then a ping, showing the ports used *then*.

Please see the attached files.

Regards,
Piotr Dobrogost

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https://lists.sourceforge.net/lists/listinfo/openvpn-devel
openvpn.log.txt (text/plain, 106.4 KB) - not displayed
ping.txt (text/plain, 308 B) 
[miner@hostx ~]$ ping -v 10.92.32.1
ping: sock4.fd: 3 (socktype: SOCK_DGRAM), sock6.fd: 4 (socktype: SOCK_DGRAM), hints.ai_family: AF_UNSPEC
ping: ai->ai_family: AF_INET, ai->ai_canonname: '10.92.32.1'
PING 10.92.32.1 (10.92.32.1) 56(84) bytes of data.
tcpdump.txt (text/plain, 9.2 KB) 
[miner@hostx ~]$ sudo tcpdump -i enp5s0 host vpn.sfx.pl
dropped privs to tcpdump
tcpdump: verbose output suppressed, use -v[v]... for full protocol decode
listening on enp5s0, link-type EN10MB (Ethernet), snapshot length 262144 bytes
18:06:14.101371 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 14
18:06:14.109679 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 26
18:06:14.110169 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 1222
18:06:14.110325 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 347
18:06:14.118547 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 22
18:06:14.136022 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 1200
18:06:14.136023 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 1188
18:06:14.136023 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 1188
18:06:14.136575 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 26
18:06:14.136635 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 1188
18:06:14.136994 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 30
18:06:14.137412 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 34
18:06:14.138541 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 34
18:06:14.145339 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 510
18:06:14.153718 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 1222
18:06:14.154224 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 1222
18:06:14.154714 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 1222
18:06:14.155148 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 1222
18:06:14.155388 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 235
18:06:14.161744 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 22
18:06:14.161744 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 22
18:06:14.161744 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 22
18:06:14.169581 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 22
18:06:14.169582 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 77
18:06:14.170308 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 420
18:06:14.178483 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 252
18:06:14.179025 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 34
18:06:15.273268 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 80
18:06:15.282579 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 22
18:06:15.282579 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 294
18:06:15.621137 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 34
18:06:16.134836 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 97
18:06:16.135196 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 225
18:06:16.141944 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 387
18:06:17.135584 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 225
18:06:18.136627 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 225
18:06:19.135609 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 92
18:06:19.135821 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 92
18:06:19.137089 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 225
18:06:19.137585 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 64
18:06:19.413595 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 64
18:06:20.136696 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 92
18:06:20.136893 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 92
18:06:20.541444 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 108
18:06:20.550251 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 105
18:06:21.355157 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 97
18:06:21.362815 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 387
18:06:21.541736 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 108
18:06:21.550201 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 105
18:06:22.137235 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 92
18:06:22.137443 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 92
18:06:22.565714 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 108
18:06:22.573739 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 105
18:06:23.589687 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 108
18:06:23.598330 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 105
18:06:24.613724 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 108
18:06:24.622128 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 105
18:06:25.637719 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 108
18:06:25.646239 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 105
18:06:26.605235 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 97
18:06:26.614641 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 387
18:06:26.661720 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 108
18:06:26.669685 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 105
18:06:27.685733 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 108
18:06:27.694247 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 105
18:06:28.709693 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 108
18:06:28.717555 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 105
18:06:29.165712 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 100
18:06:29.166395 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 100
18:06:29.174668 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 171
18:06:29.174669 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 465
18:06:29.174919 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 101
18:06:29.182695 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 148
18:06:29.733684 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 108
18:06:29.742379 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 105
18:06:30.758728 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 108
18:06:30.766405 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 105
18:06:31.781703 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 108
18:06:31.789834 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 105
18:06:31.855381 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 86
18:06:31.862314 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 376
18:06:32.805682 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 108
18:06:32.814642 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 105
18:06:33.830671 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 108
18:06:33.838210 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 105
18:06:34.355241 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 89
18:06:34.355350 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 90
18:06:34.355410 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 89
18:06:34.361811 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 137
18:06:34.361811 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 160
18:06:34.361811 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 454
18:06:34.853715 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 108
18:06:34.862479 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 105
18:06:35.877673 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 108
18:06:35.885980 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 105
18:06:36.901666 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 108
18:06:36.910367 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 105
18:06:37.105234 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 86
18:06:37.114230 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 376
18:06:37.542119 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 101
18:06:37.542297 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 101
18:06:37.551656 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 362
18:06:37.588157 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 148
18:06:37.925653 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 108
18:06:37.933017 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 105
18:06:38.197172 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 85
18:06:38.197429 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 85
18:06:38.202199 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 379
18:06:38.205911 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 548
18:06:38.949702 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 108
18:06:38.958367 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 105
18:06:39.161607 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 85
18:06:39.161768 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 85
18:06:39.170833 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 90
18:06:39.214412 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 137
18:06:39.214414 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 163
18:06:39.255430 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 377
18:06:39.605216 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 89
18:06:39.605381 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 88
18:06:39.614088 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 160
18:06:39.614088 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 81
18:06:39.973697 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 108
18:06:39.981587 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 105
18:06:40.613598 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 84
18:06:40.622004 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 81
18:06:40.622004 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 81
18:06:40.997728 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 108
18:06:41.006156 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 105
18:06:41.637639 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 84
18:06:41.645377 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 81
18:06:42.021742 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 108
18:06:42.029597 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 105
18:06:42.661564 IP hostx.34701 > xyz.sfx.pl.openvpn: UDP, length 84
18:06:42.668848 IP xyz.sfx.pl.openvpn > hostx.34701: UDP, length 81
^C
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