Public bug reported:
So I've been using OpenVPN through the network-manager-openvpn package
integrated into the network manager GUI. I experienced an odd problem
where consistently, during or after downloading (in this case, I tested
by just downloading the kernel tarball from kernel.org repeatedly, which
is around 90MB) Every single time, without fail, the openvpn client
would fail and my connection would go dead. To reconnect, I would have
to manually restart the network manager.
Now, I played around with .conf files and the CLI openvpn client and noticed
EXACTLY the same behavior happening. I eventually arrived to the conclusion
that the flag or option "auth-nocache" would cause a connection reset after or
during downloads and streaming. I then got to reading the openvpn man pages and
I stumbled across this message (you can easily find it by going 'man openvpn |
grep nocache') about the guaranteed failure of key renegotiation if
auth-user-pass and auth-nocache were used together:
" Further, using --daemon together with --auth-user-pass (entered
on console) and --auth-nocache will fail as soon as key renego‐
tiation (and reauthentication) occurs."
When I removed auth-user-pass from my .conf files, the problem went away. Then
I wondered. Now what if...network-manager-openvpn was actually passing both
flags to openvpn? Then I downloaded the source tarball and found that indeed,
this exact thing is happening on a SINGLE line. See line 1380 of
network-manager-openvpn-1.1.93/src/nm-openvpn-service.c
"add_openvpn_arg (args, "--auth-nocache");"
So I decided to comment out that single line. I then rebuilt the
packages network-manager-openvpn and network-manager-openvpn using
'dpkg-buildpackage -us -uc -nc', installed them, and tested downloading
the source kernel repeatedly to see if the connection would hold. It
does! Literally commenting out ONE line fixed weeks worth of extreme
annoyance repeatedly reconnecting to my vpn. This issue is rather
annoying and needs to be fixed so openvpn doesn't keep cutting out. I've
attached a patch for the source.
** Affects: network-manager-openvpn (Ubuntu)
Importance: Undecided
Status: New
** Tags: network-manager network-manager-openvpn openvpn
** Patch added: "The following patch removes the single offending line which
causes this issue."
https://bugs.launchpad.net/bugs/1681295/+attachment/4859305/+files/nm-openvpn-service-fix.patch
** Also affects: network-manager-openvpn (Ubuntu)
Importance: Undecided
Status: New
** No longer affects: network-manager (Ubuntu)
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https://bugs.launchpad.net/bugs/1681295
Title:
Problem in network-manager-openvpn, openvpn fails during and after
downloads.
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