Lion Server unreachable over IPv6?

I've see this Apple post already:

To manually set up your computer to use IPv6

You should only do this if your network administrator or Internet service provider has specifically told you to manually configure IPv6.

1. Choose Apple menu > System Preferences, and then click Network.
2. If the Network Preference is locked, click on the lock icon and enter your Admin password to make further changes.
3. Choose the network service you want to use with IPv6, such as Ethernet or AirPort.
4. Click Advanced, and then click TCP/IP.
5. Click on the Configure IPv6 pop-up menu (typically set to Automatically) and select Manually.
6. Enter the IPv6 address, router address, and prefix length you received from your network administrator or Internet service provider. Your router address may be referred to as your gateway address by some ISPs.

(source: http://support.apple.com/kb/HT4667)

These are my firewall rules regarding ipv6:

Problem Solved!

I just had to issue sudo ip6fw delete 65000 in Terminal.app on the server to get everything working!

regards,

Mark

The server is now without any IPv6 firewall...

If you're not sure about whether this is save, like I do at this point, you can re-enable the rule by issuing sudo ip6fw add 65000 deny ipv6 from any to any within terminal.

Take a look here if you want more info about the IPv6 Firewall (ip6fw):

https://developer.apple.com/library/mac/#documentation/Darwin/Reference/ManPages /man8/ip6fw.8.html

IPv6

In order to get IPv6 working with the services Lion has to offer, please enter the following in terminal.app @ your server (just replace the bold tekst with your IPv6 address or range):

1. sudo -s
2. ip6fw -f flush
3. ip6fw -q add allow udp from any to {your IPv6 address or range} 5678,500,1701,4500
4. ip6fw -q add allow tcp from any to {your IPv6 address or range} 8008,8443,2195,2196,5222,5223,5269,7777,139,548
5. ip6fw -q add allow tcp from any to {your IPv6 address or range} 25,110,143,587,993,995,80,443,1640
6. ip6fw -q add allow tcp from any to {your IPv6 address or range} 2195,2196,5223,625,22,311,5900,1723
7. ip6fw -q add 65535 deny all from any to any