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Thread: HOWTO set up Juniper Network Connect VPN on Ubuntu Dapper

  1. #201
    Join Date
    Jun 2006
    Location
    Lexington, MA
    Beans
    183
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: HOWTO set up Juniper Network Connect VPN on Ubuntu Dapper

    I don't think NC works well with the "free" gij Java implementation that comes with Ubuntu by default. You should install Sun's Java instead. Use Synaptic to search for sun-java6-jre and install it, or else from the command line use:
    Code:
    sudo aptitude install sun-java6-jre
    (enter your password when asked). Hopefully when you do this it will become the default Java install. If you continue to get the same error, post and I'll tell you have to change the default using the "alternatives" feature of the system.
    "Please remain calm...I may be mad, but I am a professional." --Mad Scientist

  2. #202
    Join Date
    May 2008
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    Warsaw, Poland
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    Re: HOWTO set up Juniper Network Connect VPN on Ubuntu Dapper

    Quote Originally Posted by elenctic View Post
    I am using Ubuntu 8.04 an madscientist's script to connect to a vpn. It works for awhile (usually 30s or so) and then the connection dies. My ssh session freezes.
    [...]
    I finally found out the problem. Its fix was pretty simple. My home network had an IP address collision with the VPN's remote network, so I set my home network to use a new RFC 1918 private IP range. All packets that were supposed to go to my home router were being routed straight to a machine at the other end of the VPN. It took a while for the routing table to enable the routes that the VPN adds, so that might explain why the VPN worked for a few seconds then died. I'm puzzled why this problem just showed up after I upgraded to 8.04 from 7.10 though.
    I have a similar issue, but with a few differences and I can't find any solution:
    • VPN connection hangs after 20-40 seconds
    • same results when using madscientist script and normal (web) network connect access, but it works under Windows on the same machine
    • the problem appears only if I'm behind my home firewall (Asus wireless router, but I've observed it also once with another type of cheap wireless router)
    • my LAN is in RFC 1918 private range (i've tried two different ranges), but corporate network isn't (it's 166.30/8)
    • I couldn't find any interesting logs (nor system, neither ncsvc.log) at the moment when the other side stops responding to pings
    • the problem appeared just after upgrading from 7.10 to 8.04


    After 10-20 additional seconds there's only keep-alive restart in ncsvc.log:
    ipsec.info Restarting keep-alives (engine.cpp:336)
    ipsec.warn keep alive failed for ESP tunnel in:0x...
    ipsec.warn Cleaning up sa 0x... (esp.cpp:58)
    ipsec.info Switching to NCP mode (tunnel.cpp:552)
    Any ideas?
    Last edited by w.kazimierczak; July 15th, 2008 at 01:12 AM.

  3. #203
    Join Date
    Jul 2008
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    2

    Re: HOWTO set up Juniper Network Connect VPN on Ubuntu Dapper

    Thanks madscientist. Unfortunately, I get the exact same message. Any further suggestion? Thanks.

  4. #204
    Join Date
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    Warsaw, Poland
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    5

    Re: HOWTO set up Juniper Network Connect VPN on Ubuntu Dapper

    Quote Originally Posted by w.kazimierczak View Post
    I have a similar issue, but with a few differences and I can't find any solution:
    • VPN connection hangs after 20-40 seconds
      ...

    I found the solution: I've downloaded again network connect components from VPN SSL page by pressing network connect button and typing root password when prompted by 'su'.

  5. #205
    Join Date
    May 2007
    Beans
    6

    Re: HOWTO set up Juniper Network Connect VPN on Ubuntu Dapper

    First Thank you madscientist for your big effort on this subject.
    I had some trouble getting things to work.

    After a fresh install of Ubuntu hardy :

    Code:
    sudo aptitude install sun-java6-plugin sun-java6-jdk sun-java6-jre
    Installed libstdc++2.10-glibc2.2_2.95.4-22_i386.deb (due to from error running madscientists script
    :
    Code:
    Exception in thread "AWT-EventQueue-0" java.lang.ExceptionInInitializerError
    	at NC$3.run(NC.java:1282)
    HTML Code:
    http://debian.mirror.inra.fr/debian/pool/main/g/gcc-2.95/libstdc++2.10-glibc2.2_2.95.4-27_i386.deb
    So restarting, and running madscientists script, tunnel closes immediatly.

    I did :
    Code:
    sudo passwd
    And started network connect from my companys website, and HEY PRESTO .. working I'm a happy puppy.

    What I cannot understand is why the script cannot start the tunnel.

    I'm not an expert in linux, but doing "sudo passwd" what do I risk with that ?

    The log from ncsvc when using junipernc is attached.

    thank you for all effort

    my version :
    Juniper Network Connect Server for Linux.
    Version : 1.2
    Release Version : 5.5-0-Build11905
    Build Date/time : Jun 22 2007 13:26:55
    Copyright 2002-2006 Juniper Networks
    Attached Files Attached Files
    Last edited by Baltazar72; July 21st, 2008 at 07:23 AM. Reason: typos

  6. #206
    Join Date
    Dec 2005
    Beans
    57

    Re: HOWTO set up Juniper Network Connect VPN on Ubuntu Dapper

    FOA, thanks madscientist for your contribution.

    I was looking at the main loop in your script and wondering if this is possible:

    I would like to mount a network share from a vpn after the connection is made (but obviously not before).

    My scripting knowledge is small, but it seems you need to asynchronously call to connect, wait for a message of 'connected', and finally run the mount command.

    Can anyone think of a way to do this with JNC?

    (Sorry if this is slightly off topic)

  7. #207
    Join Date
    Jul 2008
    Beans
    1

    Re: HOWTO set up Juniper Network Connect VPN on Ubuntu Dapper

    Quote Originally Posted by elenctic View Post
    I finally found out the problem. Its fix was pretty simple. My home network had an IP address collision with the VPN's remote network, so I set my home network to use a new RFC 1918 private IP range. All packets that were supposed to go to my home router were being routed straight to a machine at the other end of the VPN. It took a while for the routing table to enable the routes that the VPN adds, so that might explain why the VPN worked for a few seconds then died. I'm puzzled why this problem just showed up after I upgraded to 8.04 from 7.10 though.
    I'm having the same problem too. I'm trying to understand your fix and I don't know if it'll work for me. My home ip is 10.100.x.x/28 and the vpn tunnel is 192.168.x.x/24. I don't know if I have to change my IP range at home. I do get the TCP retransmission from wireshark.

  8. #208
    Join Date
    Jul 2006
    Location
    Denver
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    41
    Distro
    Kubuntu 10.04 Lucid Lynx

    Re: HOWTO set up Juniper Network Connect VPN on Ubuntu Dapper

    Thanks in advanced Madscientist.

    I am having the same issue as bornjcan on post #198.

    when log in via the website with my username and credentials it will start the Juniper service and connect fine. When I use your script ( which is awsome ) i receive invalid credentials. In your post #199, you mentioned that bornjcan may have used a the wrong realm. once the script info is entered how can you go back and change the realm settings?

    Kas
    Attached Images Attached Images

  9. #209
    Join Date
    Jun 2006
    Location
    Lexington, MA
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    183
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: HOWTO set up Juniper Network Connect VPN on Ubuntu Dapper

    Quote Originally Posted by kasulstyls View Post
    once the script info is entered how can you go back and change the realm settings?
    Unfortunately there's no handy GUI way to do this. Zenity only gets you so far . To rerun the configuration, you should "rm ~/.vpn.cfg" from any terminal, then restart the script.
    "Please remain calm...I may be mad, but I am a professional." --Mad Scientist

  10. #210
    Join Date
    Jan 2006
    Location
    Pennsylvania, USA
    Beans
    125
    Distro
    Kubuntu 7.04 Feisty Fawn

    Re: HOWTO set up Juniper Network Connect VPN on Ubuntu Dapper

    You can also just manually edit the ~/.vpn.cfg file to change the REALM value.
    Mark
    Kubuntu 8.04 on IBM X41T/Pentium-M LV 1.5 GHz/60GB HDD/1GB DDR2/Dual-boot Win XP Tablet Edition
    Kubuntu 6.06 on Shuttle SD11G5 mini-server/ Pentium-M 2 GHz/80 GB notebook HD/500 GB SATA II/1 GB DDR2

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