Nothing. It was moved to a new data center and changed its IP address.
Make sure your client uses DNS SRV.

-Michael

On Tue, 2016-02-09 at 22:04 +0100, Dirk Wagner wrote:
> Hi, what's happened with the devel chat?
> 
> 21:40 -!- Irssi: Removed reconnection to server ipfire.org port 5222
> 21:40 [ipfirejabber] -!- Irssi: Looking up ipfire.org
> 21:45 -!- Irssi: warning ipfire.org: no response from server
> 21:45 [ipfirejabber] -!- Irssi: Connection lost to ipfire.org
> 21:50 -!- Irssi: Removed reconnection to server ipfire.org port 5222
> 21:50 [ipfirejabber] -!- Irssi: Looking up ipfire.org