OT: Web server no longer works

[Jonathan Ryshpan]

I run a small weather station that acts as a web server.  Recently it's
become impossible to access it via the web, though I can still access it
over my local network.  Some details: 

      * My ISP is AT&T using their Uverse service. 
      * The server was accessible from the web a month or so ago. 
      * The server has web address oaklandweather.no-ip.org, which
        currently resolves to 99.121.57.131, and probably will for some
        time. 
      * I can ping the server either over the LAN or via the web without
        trouble. 
      * An attempt to connect to the weather station as a web server
        (HTTP) times out.

I'm pretty sure that the Uverse gateway is set up correctly: It worked
properly in the past and I haven't made any changes to it.  An
inspection of the settings doesn't show anything obviously wrong.

Has AT&T changed its terms of service?  I vaguely remember the terms of
service don't allow customers to run servers; but I can't find any such
restriction in documents available on the web.  Also the (AT&T supplied)
gateway has a function to explicitly open a "pinhole" allowing HTTP
service from a computer on the customer side of the gateway.

Thanks - jon