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 <CAA6tFMs76rT4iHzwy0FSn97RT2Hva3VbTHOVw-FPLV_Qz-00_Q@mail.gmail.com> 
On Thu, May 14, 2026 at 10:15 PM Gert Doering <[email protected]> wrote:
>
> Can you dump
>
>  - including the initial openvpn handshake (so we can see if userland
>    and kernel agree on the port numbers)?

Please see the attached files.
IP addresses and domains are redacted similarly to data in my previous posts.


>  - on the other side (so we can see if "something on the way" is messing
>    up this)?

This will be somewhat difficult, but if it's necessary, I can try.


> ... and please do check "nft list ruleset" if there is some weird
> NAT rule that messes up the port numbers...

It doesn't return anything.


Regards,
Piotr Dobrogost

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tcpdump.txt (text/plain, 9.8 KB) 
[miner@hostx ~]$ sudo tcpdump -i enp5s0 host xyz.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
23:46:42.258542 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 14
23:46:42.265754 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 26
23:46:42.266260 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 1222
23:46:42.266396 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 347
23:46:42.274376 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 22
23:46:42.291100 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 1200
23:46:42.291100 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 1188
23:46:42.291100 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 1188
23:46:42.291100 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 1188
23:46:42.291615 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 26
23:46:42.291995 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 30
23:46:42.292338 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 34
23:46:42.293317 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 34
23:46:42.298029 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 510
23:46:42.300764 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 1222
23:46:42.300995 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 1222
23:46:42.301202 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 1222
23:46:42.301408 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 1222
23:46:42.301531 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 235
23:46:42.309672 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 22
23:46:42.309673 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 22
23:46:42.309673 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 22
23:46:42.318112 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 22
23:46:42.318864 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 77
23:46:42.319280 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 420
23:46:42.325823 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 252
23:46:42.326291 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 34
23:46:43.327855 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 80
23:46:43.334272 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 22
23:46:43.334272 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 294
23:46:43.535470 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 34
23:46:43.696656 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 108
23:46:43.701798 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 105
23:46:44.048361 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 97
23:46:44.048729 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 225
23:46:44.053717 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 387
23:46:44.719979 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 108
23:46:44.725585 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 105
23:46:45.049117 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 225
23:46:45.744043 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 108
23:46:45.749373 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 105
23:46:46.050151 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 225
23:46:46.767996 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 108
23:46:46.772835 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 105
23:46:47.050332 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 92
23:46:47.050535 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 92
23:46:47.050635 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 225
23:46:47.051956 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 64
23:46:47.535969 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 64
23:46:47.792060 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 108
23:46:47.798511 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 105
23:46:48.051161 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 92
23:46:48.051380 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 92
23:46:48.816098 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 108
23:46:48.823731 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 105
23:46:49.271858 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 97
23:46:49.278334 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 387
23:46:49.840063 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 108
23:46:49.845847 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 105
23:46:50.053194 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 92
23:46:50.053388 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 92
23:46:50.864052 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 108
23:46:50.875106 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 105
23:46:51.888081 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 108
23:46:51.892555 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 105
23:46:52.912098 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 108
23:46:52.917009 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 105
23:46:53.936099 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 108
23:46:53.946322 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 105
23:46:54.521840 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 97
23:46:54.530464 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 387
23:46:54.960082 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 108
23:46:54.965699 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 105
23:46:55.984073 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 108
23:46:55.992653 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 105
23:46:57.008051 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 108
23:46:57.014270 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 105
23:46:58.032060 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 108
23:46:58.043390 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 105
23:46:59.056040 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 108
23:46:59.063402 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 105
23:46:59.771869 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 86
23:46:59.785012 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 376
23:46:59.886251 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 100
23:46:59.886415 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 100
23:46:59.937690 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 513
23:46:59.985061 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 471
23:47:00.080046 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 108
23:47:00.085068 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 105
23:47:01.104024 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 108
23:47:01.110241 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 105
23:47:02.128075 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 108
23:47:02.135681 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 105
23:47:03.152964 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 108
23:47:03.165703 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 105
23:47:04.176941 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 108
23:47:04.185916 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 105
23:47:05.021803 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 86
23:47:05.021915 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 100
23:47:05.022280 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 88
23:47:05.031697 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 81
23:47:05.031698 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 513
23:47:05.031698 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 376
23:47:05.199980 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 108
23:47:05.207793 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 105
23:47:06.031988 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 84
23:47:06.042901 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 81
23:47:06.224071 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 108
23:47:06.245259 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 105
23:47:07.050663 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 81
23:47:07.055961 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 84
23:47:07.063849 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 81
23:47:07.248075 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 108
23:47:07.257098 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 105
23:47:08.079967 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 84
23:47:08.091979 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 81
23:47:08.272052 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 108
23:47:08.282001 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 105
23:47:09.104969 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 84
23:47:09.115490 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 81
23:47:09.296057 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 108
23:47:09.306976 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 105
23:47:10.127947 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 84
23:47:10.137933 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 81
23:47:10.320060 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 108
23:47:10.330297 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 105
23:47:11.344044 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 108
23:47:11.354967 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 105
23:47:12.139729 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 81
23:47:12.175988 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 84
23:47:12.181849 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 81
23:47:12.368080 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 108
23:47:12.381828 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 105
23:47:13.392067 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 108
23:47:13.401710 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 105
23:47:14.416102 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 108
23:47:14.422793 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 105
23:47:15.272136 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 88
23:47:15.277073 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 81
23:47:15.440097 IP hostx.52242 > xyz.sfx.pl.netmagic: UDP, length 108
23:47:15.445418 IP xyz.sfx.pl.netmagic > hostx.52242: UDP, length 105
openvpn.log (text/x-log, 103.5 KB) - not displayed
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