Fixing Nortel Contivity Client VPN issue: Login failure due to remote host not responding

I have been receiving this error for a few days now fueling my laziness to connect at the office. But unfortunately last week I was asked to assist in implementing a major change so I need to connect from home prompting me to fix this issue or else I need wake up early and haul my *ss to the office on a weekend.

The setup is I connect to the office VPN via the Nortel Contivity client utilizing SecureID token. I keep getting the error “Login failure due to remote host not responding” when I tried to connect. I didn’t have this problem before and can connect from my “virtualized” laptop (I did a Physical-to-Virtual (p2v) migration of my office laptop so that I don’t have to bring the laptop home often).

Going through the Nortel Contivity Client document, I found this:

This is typically caused by UDP500 traffic not getting back to the requesting client through a firewall and/or router.  If your firewall/router supports IPSec passthrough you must enable IP50, IP51, UDP500 on both the source and destination (i.e. bidirectional) in order for the client to establish the connection.  Some firewalls/routers have a generic setting "Enable IPSec" or "Enable IPSec Passthrough" and simply turning this on will usually solve the problem.

The keyword here is IPSec Passthrough. In order for IPsec to work through a NAT, the following protocols need to be allowed on the firewall:

  • Internet Key Exchange (IKE) – User Datagram Protocol (UDP) port 500
  • Encapsulating Security Payload (ESP) – IP protocol number 50
  • Authentication Header (AH) – IP protocol number 51

I immediately login to my router administration panel and there it is, the IPSec Passthrough was disabled.  This might have been disabled after a recent upgrade of the router’s firmware. After enabling this feature, the VPN client connected immediately.

DD-WRT –> Security -> VPN Passthrough

By the way, I have a Linksys WRT320N using a third-party firmware called DD-WRT.


Enhanced by Zemanta


  1. home security systems reviews consumer reports

    Is gliding patio and garden panel in the privacy of your home?

  2. how do you make a aries man want you

    you may have an amazing weblog right here! would you wish to make some invite posts on my blog?

  3. A powerful share, I simply given this onto a colleague who was doing just a little analysis on this. And he actually purchased me breakfast as a result of I discovered it for him.. smile. So let me reword that: Thnx for the treat! However yeah Thnkx for spending the time to debate this, I feel strongly about it and love studying more on this topic. If possible, as you change into expertise, would you thoughts updating your weblog with extra details? It’s extremely helpful for me. Large thumb up for this blog publish!

  4. You should take part in a contest for one of the best blogs on the web. I will suggest this web site!

  5. Dadado Veig

    An impressive share! I’ve just forwarded this onto a co-worker who was conducting a little research on this. And he actually bought me breakfast due to the fact that I found it for him… lol. So allow me to reword this…. Thank YOU for the meal!! But yeah, thanx for spending time to discuss this issue here on your site.|

  6. Pingback: nipple tweezers

  7. Pingback: go to official site

  8. Pingback: istanbul h?rdavat

  9. Pingback: click here to download

  10. Pingback: how to remove consumer complaints from google

  11. That is the correct blog for anybody who desires to find out about this topic. You understand so much its nearly hard to argue with you (not that I really would need…HaHa). You undoubtedly put a new spin on a topic thats been written about for years. Great stuff, just nice!

  12. Pingback: deals

  13. click here

    You made some first rate factors there. I appeared on the web for the difficulty and found most individuals will go along with along with your website.

  14. check more

    Can I simply say what a relief to seek out somebody who truly is aware of what theyre talking about on the internet. You positively know methods to convey a difficulty to gentle and make it important. More folks need to learn this and perceive this aspect of the story. I cant consider youre not more popular because you definitely have the gift.

  15. website admin allows

    What’s up mates, how is the whole thing, and what you want to say on the topic
    of this paragraph, in my view its actually amazing in favor of me.

  16. Pingback: apps like tinder

  17. Grupo Coral presidios

    Hi to every one, it’s in fact a good for me to visit this site, it consists of valuable Information.|

  18. Pingback: rock off rapture

  19. Pingback: trading online platform

  20. secretary of energy duties

    I’m usually to blogging and i really recognize your content. The article has really peaks my interest. I’m going to bookmark your web site and preserve checking for brand new information.

  21. black friday wp theme offers 2017

    You made some decent points there. I looked on the web for the problem and located most individuals will go along with with your website.

  22. Pingback: top 5 vibrators

  23. Futurama Worlds of Tomorrow Online Generator

    WONDERFUL Post.thanks for share..extra wait .. …

  24. reverse phone directory

    Hello! I’ve been following your web site for some time now
    and finally got the courage to go ahead and give you
    a shout out from Kingwood Tx! Just wanted
    to mention keep up the good work!

  25. Pingback: slimroasts

  26. Pingback: Learn Piano Online from home

  27. Pingback: valentus slim roast coffee

  28. Umanizzare presídios

    Why people still make use of to read news papers when in this technological globe all is existing on web?|

  29. home security camera systems sams club

    To keeping your valuables safely?

  30. It’s best to take part in a contest for probably the greatest blogs on the web. I’ll recommend this site!

  31. Marvel Puzzle Quest Online Generator

    There are some fascinating closing dates in this article however I don’t know if I see all of them middle to heart. There may be some validity but I will take maintain opinion until I look into it further. Good article , thanks and we wish extra! Added to FeedBurner as well

  32. SimCity BuildIt Cheat

    An interesting dialogue is worth comment. I believe that it is best to write more on this subject, it won’t be a taboo subject but generally individuals are not enough to talk on such topics. To the next. Cheers

  33. Tyrell

    Howdy are using WordPress for your site platform?
    I’m new to the blog world but I’m trying to get started and set up my own. Do you require any html coding expertise to make your own blog?
    Any help would be really appreciated!

  34. Luiz Fernando Monteiro Bittencourt

    bookmarked!!, I love your web site!|

  35. Plants vs Zombies 2 Online Generator

    you have an incredible blog here! would you prefer to make some invite posts on my weblog?

  36. Real Racing 3 Generator

    After examine just a few of the weblog posts in your web site now, and I actually like your way of blogging. I bookmarked it to my bookmark web site record and shall be checking back soon. Pls take a look at my web site as properly and let me know what you think.

  37. Kurtis

    It is not my first time to visit this site, i am browsing this website dailly and
    get fastidious information from here daily.

  38. Pingback: how to use a suction cup dildo

  39. GSN Casino Slot Machine Games Cheat

    It’s laborious to search out educated people on this topic, however you sound like you know what you’re speaking about! Thanks

  40. Luiz Gastao Bittencourt da Silva

    Hi outstanding website! Does running a blog similar to this require a massive amount work? I have no understanding of programming however I was hoping to start my own blog in the near future. Anyhow, should you have any suggestions or techniques for new blog owners please share. I know this is off topic however I just wanted to ask. Cheers!|

  41. Pingback: remove consumer complaints

  42. Jurassic World The Game Hack

    I’m often to running a blog and i really appreciate your content. The article has really peaks my interest. I’m going to bookmark your site and hold checking for brand spanking new information.

  43. Pingback: payroll services birmingham

  44. MORTAL KOMBAT X Online Generator

    I used to be very pleased to search out this internet-site.I wanted to thanks in your time for this glorious learn!! I definitely having fun with every little bit of it and I’ve you bookmarked to take a look at new stuff you blog post.

  45. right timex look

    I used to be recommended this website by way of my cousin. I’m not positive whether this post is written by means of him as
    nobody else realize such precise about my difficulty.

    You are amazing! Thanks!

  46. Pingback: how to become a cpa

  47. reverse phone number lookup

    This is a topic that is close to my heart… Cheers!

    Exactly where are your contact details though?

  48. Pingback: cryptocurrency

  49. Pingback: quickbooks trial

  50. Pingback: dumpster rental Springfield

Leave a Comment

Your email address will not be published. Required fields are marked *