Re: Errors over VPN - message authentication code incorrect

Reply: Dan Langille: "Re: Errors over VPN - message authentication code incorrect"
In reply to: Dan Langille: "Errors over VPN - message authentication code incorrect"
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From: Marek Zarychta <zarychtam_at_plan-b.pwste.edu.pl>
Date: Sat, 08 Mar 2025 16:15:54 UTC

W dniu 8.03.2025 o 13:07, Dan Langille pisze:
> Hello,
>
> I am getting errors when transferring data over my VPN.  I'm not sure why. I've recently replace the gateway / firewall device. Previously, this VPN was stable and these types of transfers worked without error.
>
> Here is an example.  mydev is behind the firewall. r720-02 is accessed over the VPN
>
> [12:04 mydev dvl ~/tmp] % time scp -r dvl@r720-02.vpn.unixathome.org:bacula.dump .
> bacula.dump              0%    0     0.0KB/s   --:-- ETAFssh_ssh_dispatch_run_fatal: Connection to 10.10.0.217 port 22: message authentication code incorrect
> scp: Connection closed
> scp -r dvl@r720-02:bacula.dump .  0.14s user 0.01s system 21% cpu 0.665 total
>
> If I try the scp direct, without using the VPN, the copy succeeds.
>
> Ideas please?

Hello Dan,

I'm not sure what type of VPN it is, but if it's OpenVPN, you might need 
to add "tun-mtu 1400" on the server side. Please refer to PR 276838.

Cheers

-- 
Marek Zarychta