Having never heard of NetExtender before, I can only go on how you've described it in your post, and I have to say, Macs don't need third-party programs to perform 'maintenance' on them. One thing I can say is that before you upgrade your operating system, you should always make sure that all of your applications, plug-ins, drivers, extensions, etc., are compatible with what you're upgrading to. Download accelerator manager dam. That could be part of the problem, should this program not be what I think it sounds like. Are you running the most current version, and is that version compatible with El Capitan?
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SecuExtender, the Zyxel SSL VPN technology, works on both Windows and Mac operating systems. For Windows users, SecuExtender is free from pre-installation of a fat VPN client. Zyxel security appliances will push VPN client and launch auto-installation while user logs in web-based authentication portal. Check your OS Version, NetExtender only supports Win2000 or above, Mac OS X 10.5 or above with Apple Java 1.6.010 or above, and Linux OpenSUSE in addition to Fedora Core and Ubuntu. An i386-compatible Linux distribution is required, along with Sun Java 1.6.010+.
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