Missing --no-dtls option

Bug #1500826 reported by Martin Smith on 2015-09-29
24
This bug affects 5 people
Affects Status Importance Assigned to Milestone
network-manager-openconnect
Confirmed
Wishlist
network-manager-openconnect (Ubuntu)
Undecided
Unassigned

Bug Description

After upgrading to 15.10 a few weeks earlier than release (29 Sep 2015), I noticed DTLS stopped working in openconnect. However, I found a workaround which was to use --no-dtls. But there's no way to pass this option from Network Manager as far as I can tell (no config file option or GUI).

Please advise if there's a workaround (or if the options are documented anywhere).

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: network-manager-openconnect-gnome 1.0.2-1build1
ProcVersionSignature: Ubuntu 4.2.0-11.13-generic 4.2.1
Uname: Linux 4.2.0-11-generic x86_64
ApportVersion: 2.19-0ubuntu1
Architecture: amd64
CurrentDesktop: GNOME
Date: Tue Sep 29 06:10:33 2015
InstallationDate: Installed on 2014-07-02 (453 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
SourcePackage: network-manager-openconnect
UpgradeStatus: Upgraded to wily on 2015-09-29 (0 days ago)

Martin Smith (martinb3) wrote :
Changed in network-manager-openconnect:
importance: Unknown → Wishlist
status: Unknown → Confirmed
Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in network-manager-openconnect (Ubuntu):
status: New → Confirmed
Peter Ruibal (fmoo) wrote :

Is there a bounty program for wishlist features? Happy to sponsor development of this.

dwmw2 (dwmw2) wrote :

This is https://bugzilla.gnome.org/show_bug.cgi?id=702154 — it's not hard to implement, but you really shouldn't *need* to disable DTLS. We should use it only when it's working.

Alex Murray (alexmurray) wrote :

@dwmw2 - are there any logs etc I can capture to help debug this to get the dtls fallback or whatnot working correctly?

dwmw2 (dwmw2) wrote :

If it really is resolved by using --no-dtls then show output with DTLS enabled and with '-vv' on the command line. Make sure you're using up-to-date GnuTLS and OpenConnect though.

FlashBuster (flashbuster) wrote :

Today, i've spent several hours hunting this down.
I've finally figured out, that my OpenVPN connection becomes unresponsive after visiting 2-3 websites, because my DSL router (Speedport W921V) "detects" some UDP connections as DoS attack.
This seems to be a problem of several routers and unfortunately there is no way to configure the router firewall.

Now, if i start the VPN manually with the --no-dtls option the connection works fine.
I'd really love to have this configurable in NetworkManager because i'm used to use the NetworkManager and not the openconnect CLI client.

For searchability: The router log message says "DoS(Denial of Service) Angriff fragmentation flood wurde entdeckt. (FW101)".

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