Configuring Teredo client - which teredo server to use?

[Guest]

How do I configure the Teredo client on my Windows XP SP2 to get a valid
Teredo based IPv6 address?

I am running Windows XP SP2 - with all the latest patches
I want to get a valid Teredo based IPv6 address.
I have read the excellent MSDN article that explains the details of Teredo.

Here is what I did

- I ran "ipconfig /all" - portion of the output related to teredo

Tunnel adapter Teredo Tunneling Pseudo-Interface:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-00
Dhcp Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : fe80::5445:5245:444f%9
Default Gateway . . . . . . . . . :
NetBIOS over Tcpip. . . . . . . . : Disabled

there were other Tunnel adapters and Ethernet Adapters whihc is not shown
above.

- I ran netsh interface ipv6 show teredo - here is the output
netsh interface ipv6>show teredo
Teredo Parameters
---------------------------------------------
Type : client
Server Name : default
Client Refresh Interval : default
Client Port : default
State : offline
Error : secondary server address unreachable

- I then ran tried a name of few Teredo Servers - I started with
teredo.ipv6.microsoft.com

netsh interface ipv6>set teredo client teredo.ipv6.microsoft.com 30
Ok.

netsh interface ipv6>show teredo
Teredo Parameters
---------------------------------------------
Type : client
Server Name : teredo.ipv6.microsoft.com
Client Refresh Interval : 30 seconds
Client Port : default
State : probe(cone)
Type : teredo host-specific relay
Network : managed
NAT : cone

- After some time - this was the output for show teredo
netsh interface ipv6>show teredo
Teredo Parameters
---------------------------------------------
Type : client
Server Name : teredo.ipv6.microsoft.com
Client Refresh Interval : 30 seconds
Client Port : default
State : offline
Error : secondary server address unreachable

- I tried the following server names
- teredo.ipv6.6wind.com
- teredo.remlab.net
- teredo.autotrans.consulintel.com
- teredo.ipv6.microsoft.com
- 203.233.154.10

I always get the error message on shwo teredo - "Error : secondary server
address unreachable" . The ipconfig /all is same as what was shown earlier.

I also changed the Registry - added 0x120 to HKLM...GlobalParams\TeredoPrefix

Please help - what am I missing here? Any pointers to any web links will
also be very helpful. How do I get a Teredo based IPv6 address? Address with
the new 2001::/32 prefix is preferred. Anyway the older IPv6 prefix
3ffe:83192::/32 has been phased out.