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[Bug 1254085] Re: ssh fails to connect to VPN host - hangs at 'expecting SSH2_MSG_KEX_ECDH_REPLY'

 

I had this same problem today and we changed the MTU to 1500 on the
remote server we were trying to connect to and everything worked
straight afterwards. I was trying to do a simple git clone
user@domain:group/repo.git.

>From the local server I was connecting from to do the clone it would
always hang at debug1: SSH2_MSG_KEXINIT sent and then time out.

Remote Server:
openssh-server:
  Installed: 1:6.6p1-2ubuntu2
  Candidate: 1:6.6p1-2ubuntu2
  Version table:
 *** 1:6.6p1-2ubuntu2 0
        500 http://za.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     1:6.6p1-2ubuntu1 0
        500 http://za.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages

Local Server (Gentoo):
*  net-misc/openssh
      Latest version available: 6.7_p1
      Latest version installed: 6.7_p1
      Size of files: 1344 KiB
      Homepage:      http://www.openssh.org/
      Description:   Port of OpenBSD's free SSH release
      License:       BSD GPL-2

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https://bugs.launchpad.net/bugs/1254085

Title:
  ssh fails to connect to VPN host - hangs at 'expecting
  SSH2_MSG_KEX_ECDH_REPLY'

Status in openssh package in Ubuntu:
  Confirmed

Bug description:
  ssh -vvv <host> is failing for me where <host> is a VPN system.

  VPN is configured and connected via network-manager. Last messages
  from ssh (hangs forever):

  debug2: kex_parse_kexinit: none,zlib@xxxxxxxxxxx
  debug2: kex_parse_kexinit: none,zlib@xxxxxxxxxxx
  debug2: kex_parse_kexinit: 
  debug2: kex_parse_kexinit: 
  debug2: kex_parse_kexinit: first_kex_follows 0 
  debug2: kex_parse_kexinit: reserved 0 
  debug2: mac_setup: found hmac-md5
  debug1: kex: server->client aes128-ctr hmac-md5 none
  debug2: mac_setup: found hmac-md5
  debug1: kex: client->server aes128-ctr hmac-md5 none
  debug1: sending SSH2_MSG_KEX_ECDH_INIT
  debug1: expecting SSH2_MSG_KEX_ECDH_REPLY

  
  = Workaround =

  $ sudo apt-get install putty
  $ putty <host>

  This works perfectly.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: openssh-client 1:6.4p1-1
  ProcVersionSignature: Ubuntu 3.12.0-3.8-generic 3.12.0
  Uname: Linux 3.12.0-3-generic i686
  NonfreeKernelModules: nvidia
  ApportVersion: 2.12.7-0ubuntu1
  Architecture: i386
  CurrentDesktop: Unity
  Date: Fri Nov 22 15:37:18 2013
  InstallationDate: Installed on 2010-10-21 (1128 days ago)
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
  RelatedPackageVersions:
   ssh-askpass       1:1.2.4.1-9
   libpam-ssh        N/A
   keychain          2.7.1-1
   ssh-askpass-gnome 1:6.4p1-1
  SSHClientVersion: OpenSSH_6.4p1 Ubuntu-1, OpenSSL 1.0.1e 11 Feb 2013
  SourcePackage: openssh
  UpgradeStatus: Upgraded to trusty on 2013-11-01 (20 days ago)

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