David Weck

  1. Securing Novell® GroupWise® with Citrix NetScaler AAA-TM

    When confronted with the task to implement single sign on for Novell GroupWise, the web based email frontend of Novell’s groupware solution, it turned out that many before me had tried to implement form based authentication to that web application with various products already. Whichever product as gateway were used, all attempts seem to have failed unless heavy customizations were involved. As with other enterprise applications ...

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  2. Build your own VPN client with the shared Access Gateway client API library

    In a former blog article I explained the two different user interfaces of the NetScaler Access Gateway plug-in. As outlined in that article already, my client was not satisfied with the look and feel of the software interface and asked for something more flexible and extensible (e.g. running certain programs depending on the tunnel being up or not). In order to accommodate this and similar requests, Citrix ...

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  3. Access Gateway native logon option explained

    The SSL VPN offered by NetScaler Access Gateway utilizes the systems web browser for logon to the network. This brings certain advantages, for instance the possibility to logon can be made depending on the result of endpoint security checks, it offers a way to deploy the VPN client to users who haven’t installed it yet and allows for integration with NetScaler’s own or internal web ...

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  4. GeoLite City as NetScaler location database

    You may know this problem: Your boss made you build several data centers around the globe with a bunch of NetScalers in the mix to load balance services across the various locations using GSLB (Global Server Load Balancing). But when it comes to configuring a static proximity geo IP database to help with that not too easy to understand dynamic proximity feature you notice most ...

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  5. When UDP is not enough – what to do with large DNS responses

    On a recent NetScaler project a fairly simple task turned out be a bit more complicated than we anticipated. After bit of troubleshooting we discovered the reason and eventually  a solution was found thanks to  Kadda Toumi, Citrix Escalation Engineer who very helpfully assisted me. For virtually all NetScaler and/or Access Gateway projects DNS is a crucial part of the deployment, hence we started off creating a ...

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  6. Before, after or at the very end?

    We've been asked several times what's the proper way on a NetScaler to make changes to the default system configuration persistent so that they survive a reboot. There are several articles already covering different ways highlighting this topic for your user interface customizations, however a similar process applies to nsapimgr commands you may need in your environment. Most articles tell you to put everything in rc.netscaler. ...

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