"SSL network extender service is down" error in IE11

I resolved this issue by manually downloading the Windows 7 version of SNX (SSL Network Extender). It can be downloaded here, or found by searching for "SNX R71 For Windows 7"

The version I got is the following:

> File Name:        Check_Point_SNX_R71HFA1_For_Windows_800005013.msi
> Product:          SSL Network Extender Version    R71 Minor Version   HFA 01
> OS:               Windows, Windows 7 Build Number 
> MD5:              381dd25826c43f97e3f36308368fa8e6 
> Size:             722.43 KB 
> Date Published:   12/31/2009

After download and install I was prompted about downloading a newer updated version, and asked abount installing some Java applets. Accepting everything made it possible for me to login via Internet Explorer 11 in Windows 10.

UPDATE

While it (somewhat) works to run IE 11 as administrator, I thought I wanted to tell what the real problem is:

It turns out that it often is the SSL VPN for the server that doesn't support Windows 10. I have heard that checkpoint offers an official patch for Windows 10, but it requires a firewall upgrade.

Full support should be on its way from Checkpoint, but I don't know when. Until then they offer a beta client that I havn't tested, but that I have heard should solve most of the problems.

I resolved this issue by running IE 11 as an Administrator.