I can't connect to irc.ubuntu.com

[Markus Schönhaber]

Kinch Zhang wrote:

> I've failed to connect to irc.ubuntu.com for quite a long time.
> 
> My IRC client is Pidgin 2.2.1 , and my internet connection is ok .
> 
> But I can "ping" irc.ubuntu.com successfully ( below is the statistics )
> 
>  ~$ ping irc.ubuntu.com
> PING chat.freenode.net (64.161.254.20) 56(84) bytes of data.
> 64 bytes from kubrick.freenode.net (64.161.254.20): icmp_seq=1 ttl=51
> time=499 ms
[...]
> 
> So this problem is really weird ( I also tried ChatZilla but it kept
> connecting ...)

What I'd check is:
- connection to other irc servers/networks
- irc.ubuntu.com is an alias to chat.freenode.net which, in turn,
resolves to quite some addresses:
----
~$ host irc.ubuntu.com
irc.ubuntu.com is an alias for chat.freenode.net.
chat.freenode.net has address 64.161.254.20
chat.freenode.net has address 82.96.64.4
chat.freenode.net has address 130.239.18.172
chat.freenode.net has address 140.211.166.3
chat.freenode.net has address 140.211.166.4
chat.freenode.net has address 154.35.200.44
chat.freenode.net has address 204.11.244.21
chat.freenode.net has address 207.158.1.150
chat.freenode.net has address 208.71.169.36
chat.freenode.net has address 209.177.146.34
chat.freenode.net has address 213.92.8.4
chat.freenode.net has address 216.165.191.52
-----
does your DNS give a similar answer?
- connection to the IP addresses instead of the name
- something like
~$ sudo hping3 --syn --traceroute --destport 6667 irc.ubuntu.com
to see where packets get dropped.

Gruß
  mks