Server is moving again to 18.104.22.168. Website and gathers should work for users transparently. However if you have any issues loading the main webpage, read this.
If you have any trouble loading NS2 gathers application, just empty your cache and re-log into ensl website. If it whines about security issue or certificate, accept the risk and continue. Easy way is also to check the same page with another browser.
The server move will happen somewhere within the week.
Also the website will have major update, but mostly internal fixes. I have worked for these for quite some time now. I will do another announcement when we have something much more showable. In the future, I'd like to do a lot of updates to the website that would improve usability and possibly layout.
edit: Updated with a link to article.