Re: Errors over VPN - message authentication code incorrect
"Dan Langille" <[email protected]>
| Newsgroups | gmane.os.freebsd.devel.net |
|---|---|
| Message-ID | <[email protected]> |
On Sat, Mar 8, 2025, at 11:15 AM, Marek Zarychta wrote: > 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 [email protected]: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. Yes, this is OpenVPN 2.6.13 on FreeBSD 14.2 I just tried "tun-mtu 1400" on the server side. I restarted all clients. Problem persists. I also added "mssfix" to the server, restarted server, restarted all clients. Problem persists. As I read the PR again, it mentions "As of today, kernel openvpn does not seem to support `mssfix` - I'm not sure what "kernel openvpn" is. The server configuration contains 'disable-dco'. PR 276838 mentions DCO, so given it is disabled, wtf? I notice that the problem exists on all the OpenVPN client except one. That client is on FreeBSD 14.2, the failing clients are all on FreeBSD 14.1 - hmmm. That is curious. Perhaps I should update one of the clients and try again. Thank you. -- Dan Langille [email protected]