I moved recently and just set up one of my boxes and could not get to my web interface.  I checked all network connections and then booted into the GUI mode and noticed that when I opened firefox, even http://localhost was unavailable.  I was able to get to things like Google though, so it does not appear to be a network issue.  I have attached my diagnostics I was able to generate.

panther-diagnostics-20161222-1932.zip

That diagnostics file seems to be about a week old...

 

Edit: ...and there are a bunch of old incompatible packages loaded. I would guess they are either left over from upgrading the system without removing stuff that should have been removed, or from simply manually installing incompatible plugins. Get rid of them.

You might want to restart in safe mode.

 

On the Diagnostics posted (which looks like it stopped on December 22), Transmission triggered and out of memory error which may or may not be the cause of all this.

 

I also see that you're installing a Crashplan plugin, but I don't believe that there is one that is v6.1+ compatible.

I ran diags based off emailing support, but have not heard back in a few days so I thought I would try my luck with the forums.

 

I will try safemode and uninstalling transmission and crash plan to see if that gets me anywhere.  Will post back when I have an update (probably tomorrow).